CustomPickerField

Depending on the data, you can use filter(), reject() or a combination of wherecontains() and remove() to achieve this.

@ankitab918....As above practitioner suggested Use filter() or wherecontains() to eliminate the values that are already entered..

you can pass a variable into your gridRowLayout() rule which holds the highest index value. For the picker field component, you can make it disabled if the current value [index] <> highest index value. This will disabled all rows except the last

Thanks for all the suggestion. Instead of eliminating the values from the suggestion, I want a validation error. I am using the below code to achieve that. The validation is working fine for the last row, however, it is validating against all the above rows as well. Please refer the attachment for the UI.
validations:if(any(rule!CP_MatchAnyExistingDoc(_,ri!document[ri!index]),apply(index(ri!document,_),1+enumerate(count(ri!document)-1))),

"This document already exist for the claim. Duplicates not allowed","")

---rule!CP_MatchAnyExistingDoc-----
if(
ri!existingDoc.Document.DocName=ri!newDoc.Document.DocName,true,false()
)

I replaced the above code with the below one. Instead of ri!index, I used count(ri!document) as index to get the last row. It seems to do the trick. However, the validation message is showing on all rows.

if(any(rule!CP_MatchAnyExistingDoc(_,ri!document[count(ri!document)]),apply(index(ri!document,_),1+enumerate(count(ri!document)-1))),

"This document already exist for the claim. Duplicates not allowed","")

@ankitab Apply the validation only in the case of editable rows or skip the validation in case of read only rows. I guess you can use the same logic which you have applied for making a row read only or editable and then control the validations based on the same.

Hi sikhivahans, It worked. Thanks :)