Expression evaluation error in rule at function 'localvariables' [line 13]: LocalVariables expects final parameter to be its result value, not a definition of local variable 'local!data'? How to fix that?

Question

if(
 not(ri!executeWhen),
 {
 data: a!dataSubset(
 startIndex: ri!pagingInfo.startIndex,
 batchSize: ri!pagingInfo.batchSize,
 sort: ri!pagingInfo.sort,
 totalCount: 0,
 data: {},
 identifiers: {}
 )
 },
 a!localVariables(
 local!employeeList: cast(
 typeof(
 {
 'type!{urn:com:appian:types:INO}INO_employee'()
 }
 ),
 ri!employeeDataSubset.data
 ),
 local!staffList: index(
 local!employeeList,
 where(
 a!forEach(
 items: local!employeeList,
 expression: and(
 tointeger(fv!item.designationId) = cons!INO_DESIG_ID_STAFF,

 )
 )
 ),
 {}
 ),
 local!employeeIdList: index(local!staffList, "internalEmpId", {}),
 local!operationsCodeIdList: index(local!staffList, "operationsCodeId", {}),
 local!dateList: if(
 isnull(ri!selectedDateList),
 {},
 todatasubset(
 a!forEach(
 items: ri!selectedDateList,
 expression: a!map(date: fv!item)
 ),
 a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: a!sortInfo(field: "date", ascending: true)
 )
 ).data.date
 ),
 local!scorecardUserLoginDailyDetailData: 
 a!localVariables(
 local!data: local!employeeIdList,
 local!batchSize: cons!INO_queryOptimisationBatchSize,
 local!numberOfIteration: int(length(local!data) / local!batchSize),
 local!md: mod(length(local!data), local!batchSize),
 local!dataToSplit: rdrop(local!data, local!md),
 if(
 length(local!employeeIdList) <= local!batchSize,
 rule!INO_queryScorecardUserLoginDailyDetail(
 pagingInfo: a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: {
 a!sortInfo(field: "internalEmpId", ascending: true),
 a!sortInfo(field: "userloginDate", ascending: true)
 }
 ),
 employeeIdList: local!employeeIdList,
 dateList: ri!selectedDateList,
 operationsCodeIdList: local!operationsCodeIdList,
 departmentId: null
 ),
 append(
 a!forEach(
 items: enumerate(local!numberOfIteration),
 expression: a!localVariables(
 local!rdp: rdrop(
 local!dataToSplit,
 (
 local!batchSize * (local!numberOfIteration - fv!index)
 )
 ),
 local!lrdp: ldrop(local!rdp, local!batchSize * (fv!index - 1)),
 rule!INO_queryScorecardUserLoginDailyDetail
 (
 executeWhen: ri!executeWhen,
 pagingInfo: a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: {
 a!sortInfo(field: "internalEmpId", ascending: true),
 a!sortInfo(field: "userloginDate", ascending: true)
 }
 ),
 employeeIdList: local!lrdp,
 dateList: ri!selectedDateList,
 operationsCodeIdList: local!operationsCodeIdList,
 departmentId: null,

 )
 )
 ),
 rule!INO_queryScorecardUserLoginDailyDetail(
 executeWhen: ri!executeWhen,
 pagingInfo: a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: {
 a!sortInfo(field: "internalEmpId", ascending: true),
 a!sortInfo(field: "userloginDate", ascending: true)
 
 }
 ),
 employeeIdList: difference(local!data, local!dataToSplit),
 dateList: ri!selectedDateList,
 operationsCodeIdList: local!operationsCodeIdList,
 departmentId: null
 )
 )
 ),
 ),
 local!queryData: cast(
 typeof(
 {
 'type!{urn:com:appian:types:INO}INO_scorecard_UserloggingInfoDaily'()
 }
 ),
 index(
 local!scorecardUserLoginDailyDetailData,
 "data",
 {}
 )
 ),
 local!data: a!forEach(
 items: local!staffList,
 expression: a!localVariables(
 local!empData: index(
 local!queryData,
 wherecontains(
 fv!item.internalEmpId,
 tointeger(local!queryData.internalEmpId)
 )
 ),
 local!employee: fv!item,
 {
 a!forEach(
 items: local!dateList,
 expression: a!localVariables(
 local!userloginDate: day(fv!item),
 
 if(
 not(
 rule!INO_isBlank(
 index(
 local!empData,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 fv!item.userloginDate = local!userloginDate,
 
 )
 )
 ),
 null
 )
 )
 ),
 index(
 local!empData,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 fv!item.userloginDate = local!userloginDate
 
 )
 )
 ),
 null
 ),

 'type!{urn:com:appian:types:INO}INO_scorecard_UserloggingInfoDaily'(

 internalEmpId: index(local!employee, "internalEmpId", null),
 /*hireDate: index(local!employee, "hireDate", null),*/
 userloginDate: day(fv!item),
 dimSupervisorID: tointeger(
 index(
 local!empData.dimSupervisorID,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 index(local!empData, "userloginDate") = local!userloginDate
 
 )
 )
 ),
 null
 )
 ),
 dimManagerID: tointeger(
 index(
 local!empData.dimManagerID,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 index(local!empData, "userloginDate") = local!userloginDate
 )
 )
 ),
 null
 )
 )
 )
 )
 )
 ) /*Doubt about CDT*/
 }
 )
 ),
 /* local!filterDataByHireDate: a!forEach(
 items: local!data,
 expression: a!localVariables(
 local!upperIndex: fv!index,
 a!forEach(
 items: fv!item,
 expression: a!localVariables(
 local!hiredate: date(
 year(
 if(
 rule!INO_isBlank(fv!item.hireDate),
 today(),
 fv!item.hireDate
 )
 ),
 month(
 if(
 rule!INO_isBlank(fv!item.hireDate),
 today(),
 fv!item.hireDate
 )
 ),
 1
 ),
 local!selectedDate: day(fv!item.userloginDate),
 if(
 local!selectedDate < local!hiredate,
 'type!{urn:com:appian:types:INO}INO_scorecard_UserloggingInfoDaily'(
 internalEmpId: fv!item.internalEmpId,
 hireDate: fv!item.hireDate,
 userloginDate: fv!item.userloginDate,
 dimSupervisorID: fv!item.dimSupervisorID,
 dimManagerID: fv!item.dimManagerID
 ),
 fv!item
 )
 )
 ),

 )
 ),*/ 
 /*Doubt about CDT*/
 /*{
 data: todatasubset(
 cast(
 typeof(
 {
 'type!{urn:com:appian:types:INO}INO_scorecard_UserloggingInfoDaily'()
 }
 ),
 append(
 local!filterDataByHireDate,
 )
 ),
 a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: ri!pagingInfo.sort
 )
 ),
 }*/
 )
)

Mathieu Drouin · Answer

The message is pretty self explanatory. You need to add local!data as the return variable. 
 if(
 not(ri!executeWhen),
 {
 data: a!dataSubset(
 startIndex: ri!pagingInfo.startIndex,
 batchSize: ri!pagingInfo.batchSize,
 sort: ri!pagingInfo.sort,
 totalCount: 0,
 data: {},
 identifiers: {}
 )
 },
 a!localVariables(
 local!employeeList: cast(
 typeof(
 {
 'type!{urn:com:appian:types:INO}INO_employee'()
 }
 ),
 ri!employeeDataSubset.data
 ),
 local!staffList: index(
 local!employeeList,
 where(
 a!forEach(
 items: local!employeeList,
 expression: and(
 tointeger(fv!item.designationId) = cons!INO_DESIG_ID_STAFF,

 )
 )
 ),
 {}
 ),
 local!employeeIdList: index(local!staffList, "internalEmpId", {}),
 local!operationsCodeIdList: index(local!staffList, "operationsCodeId", {}),
 local!dateList: if(
 isnull(ri!selectedDateList),
 {},
 todatasubset(
 a!forEach(
 items: ri!selectedDateList,
 expression: a!map(date: fv!item)
 ),
 a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: a!sortInfo(field: "date", ascending: true)
 )
 ).data.date
 ),
 local!scorecardUserLoginDailyDetailData: 
 a!localVariables(
 local!data: local!employeeIdList,
 local!batchSize: cons!INO_queryOptimisationBatchSize,
 local!numberOfIteration: int(length(local!data) / local!batchSize),
 local!md: mod(length(local!data), local!batchSize),
 local!dataToSplit: rdrop(local!data, local!md),
 if(
 length(local!employeeIdList) <= local!batchSize,
 rule!INO_queryScorecardUserLoginDailyDetail(
 pagingInfo: a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: {
 a!sortInfo(field: "internalEmpId", ascending: true),
 a!sortInfo(field: "userloginDate", ascending: true)
 }
 ),
 employeeIdList: local!employeeIdList,
 dateList: ri!selectedDateList,
 operationsCodeIdList: local!operationsCodeIdList,
 departmentId: null
 ),
 append(
 a!forEach(
 items: enumerate(local!numberOfIteration),
 expression: a!localVariables(
 local!rdp: rdrop(
 local!dataToSplit,
 (
 local!batchSize * (local!numberOfIteration - fv!index)
 )
 ),
 local!lrdp: ldrop(local!rdp, local!batchSize * (fv!index - 1)),
 rule!INO_queryScorecardUserLoginDailyDetail
 (
 executeWhen: ri!executeWhen,
 pagingInfo: a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: {
 a!sortInfo(field: "internalEmpId", ascending: true),
 a!sortInfo(field: "userloginDate", ascending: true)
 }
 ),
 employeeIdList: local!lrdp,
 dateList: ri!selectedDateList,
 operationsCodeIdList: local!operationsCodeIdList,
 departmentId: null,

 )
 )
 ),
 rule!INO_queryScorecardUserLoginDailyDetail(
 executeWhen: ri!executeWhen,
 pagingInfo: a!pagingInfo(
 startIndex: 1,
 batchSize: - 1,
 sort: {
 a!sortInfo(field: "internalEmpId", ascending: true),
 a!sortInfo(field: "userloginDate", ascending: true)

 }
 ),
 employeeIdList: difference(local!data, local!dataToSplit),
 dateList: ri!selectedDateList,
 operationsCodeIdList: local!operationsCodeIdList,
 departmentId: null
 )
 )
 ),
 ),
 local!queryData: cast(
 typeof(
 {
 'type!{urn:com:appian:types:INO}INO_scorecard_UserloggingInfoDaily'()
 }
 ),
 index(
 local!scorecardUserLoginDailyDetailData,
 "data",
 {}
 )
 ),
 local!data: a!forEach(
 items: local!staffList,
 expression: a!localVariables(
 local!empData: index(
 local!queryData,
 wherecontains(
 fv!item.internalEmpId,
 tointeger(local!queryData.internalEmpId)
 )
 ),
 local!employee: fv!item,
 {
 a!forEach(
 items: local!dateList,
 expression: a!localVariables(
 local!userloginDate: day(fv!item),

 if(
 not(
 rule!INO_isBlank(
 index(
 local!empData,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 fv!item.userloginDate = local!userloginDate,

 )
 )
 ),
 null
 )
 )
 ),
 index(
 local!empData,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 fv!item.userloginDate = local!userloginDate

 )
 )
 ),
 null
 ),

 'type!{urn:com:appian:types:INO}INO_scorecard_UserloggingInfoDaily'(

 internalEmpId: index(local!employee, "internalEmpId", null),
 /*hireDate: index(local!employee, "hireDate", null),*/
 userloginDate: day(fv!item),
 dimSupervisorID: tointeger(
 index(
 local!empData.dimSupervisorID,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 index(local!empData, "userloginDate") = local!userloginDate

 )
 )
 ),
 null
 )
 ),
 dimManagerID: tointeger(
 index(
 local!empData.dimManagerID,
 where(
 a!forEach(
 items: local!empData,
 expression: and(
 index(local!empData, "userloginDate") = local!userloginDate
 )
 )
 ),
 null
 )
 )
 )
 )
 )
 ) /*Doubt about CDT*/
 }
 )
 ),
 local!data
 )
)