Record picker component multiple values

Your field must be List of Text or List of Number type to store multiple values.
A single Text field (even with 4000 length) can only store one value, causing not available for multiple selections.

 a!pickerFieldRecords(
   maxSelections: 10,
   label: "Production Issue CMS Number",
   recordType: 'recordType!{e0c12f8e-caab-4b8d-8fb8-810b9e603906}NPPI Request',
  
   labelPosition: "JUSTIFIED",
   placeholder: "Please Enter CMS Number",

   value: if(
     a!isNullOrEmpty(
       ri!Request['recordType!{97af410e-2531-4d70-9548-10b202a9d59c}NPDO Request.fields.{8f861e97-4dcd-4b44-a9ac-0c7e3a22e4e5}requestid']
     ),
     local!cmsNumbers,
     a!localVariables(
       local!cmsId:split(
         ri!Request['recordType!{97af410e-2531-4d70-9548-10b202a9d59c}NPDO Request.fields.{43200a57-947e-46c0-8955-075b6040070d}productionissuecms'],
         ";"
       ),
       a!forEach(
         local!cmsId,
         a!queryRecordType(
           recordType: 'recordType!{e0c12f8e-caab-4b8d-8fb8-810b9e603906}NPPI Request',
           fields: {
             'recordType!{e0c12f8e-caab-4b8d-8fb8-810b9e603906}NPPI Request.fields.{e00ba175-0045-47f7-ac40-dabe37e4b505}requestId'
           },
           filters: {
             a!queryFilter(
               field: 'recordType!{e0c12f8e-caab-4b8d-8fb8-810b9e603906}NPPI Request.fields.{e00ba175-0045-47f7-ac40-dabe37e4b505}requestId',
               operator: "=",
               value: tointeger(fv!item),

             ),

           },
           pagingInfo: a!pagingInfo(startIndex: 1, batchsize:100)
         ).data[ 'recordType!{e0c12f8e-caab-4b8d-8fb8-810b9e603906}NPPI Request.fields.{e00ba175-0045-47f7-ac40-dabe37e4b505}requestId']
       )
     )
   ),
   saveInto: {
     local!cmsNumbers,
     a!save(
       ri!Request['recordType!{97af410e-2531-4d70-9548-10b202a9d59c}NPDO Request.fields.{43200a57-947e-46c0-8955-075b6040070d}productionissuecms'],
       local!cmsNumbers
     )
   },
  
 ),

There is no option to make record field to array .I have tried the above approach  but its allowing duplicate records , 

To store multiple values in a single field, a bad idea by the way, a good approach is to store the list a values as a JSON string.

Thanks for the suggestions, how should I do that? Just by using the jason function and saving it in the same field or something else i Have to do .Can you help me? 

In line 44 use tojson() to convert the list into a JSON string.

In 9 use fromjson() to convert the JSON string into a list of values. You might have to add null-checks as fromjson() fails on invalid JSON.

In line 44 use tojson() to convert the list into a JSON string.

In 9 use fromjson() to convert the JSON string into a list of values. You might have to add null-checks as fromjson() fails on invalid JSON.