Issue in Form personalization in AR invoice line level

Hi,

I am working on form personalization in Oracle apps R12.2.4 on AR transactions form at Line level.

We want a segment to be Mandatory on Invoice Line DFF for certain conditions only(dynamically). I have done form personalization & working fine for new invoices. But issue is when I search for existing invoices with multiple lines where this DFF segment is blank.

I wrote cond.n & action on following

Trigger event:  WHEN-VALIDATE-RECORD

Trigger Object: TLIN_LINES

When I click on Line Items tab in Trx form, It's not showing all records at same time (as shown in screenshot). it's shows records and stops at record where error comes i.e. expected error msg to enter DFF segment value as internally validate-record trigger getting fired. After giving value to DFF segment for that line, later following record are not coming on form. I have to close line level block and again click on Line Items tab in Trx form then further record shows and stops at record where error occurs.