Invoice Serial No in General LedgerPLD

Good Morning all

I have a query regarding fetch database value in PLD.

I am generating a general ledger report for a revenue account. In PLD it is fetching record like Doc No, Due Date etc using system variable in repetitive area. Now using Doc No I want to fetch some information from the documents.

But even using link or relate to, it is not working.

Please if anyone can help.

Thanks & Regards

Annu