Type comparison error

 Hi,

I'm getting "Cannot compare type" error while executing the rule. Below is the code i'm using

* Code inside parent interface

local!details:apply(
rule!LeaveDetailsMerge(
empDataSubSet_cdt: _,
leaveDataSubSet_cdt:local!leaveDataSubSet.data
),
local!empDataSubSet.data
),

* Code inside "LeaveDetailsMerge" 

with(
local!setOfMatchingData: index(
ri!leaveDataSubSet_cdt,
wherecontains(
cast(3,ri!empDataSubSet_cdt.EmployeeUserName),
cast(103,ri!leaveDataSubSet_cdt.EmployeeUserName)
),
{}
),
{
EmployeeDetails:ri!empDataSubSet_cdt,
LeaveDetails: union(local!setOfMatchingData,local!setOfMatchingData)
}
)

If I will just print the values of empDataSubset_cdt or LeaveDataSubSet_cdt, It shows the correct information but when I'm trying to use the above logic it ends up throwing the type conversion error. I also checked by changing the cast(103) to cast(3) but in that case It will not display any data inside LeaveDetails. Can someone please let me know what mistake i'm doing inside the code? Thanks in advance