Vendor Ref. Number from A/P Invoice & Credit Memo in the Check PLD Form

Hi Guys,

We have standard PLD layout form for the Check Document. In our case the Check Document based on the outgoing payment and

outgoing payment referenced on A/P Invoice and Credit Memo documents.

Is there someone who knows how to get "Vendor Ref. Number" (NumAtCard) field from A/P Invoice and Credit Memo in the Cheque form?

Any ideas will be appreciated.

Thanks so much,

Sergey