How to display text of type field from SAP B1?.

Hi all,

I set field type as active from form settings in purchase order but if I select text (T) in drop down and then write text in that line I can add document fine, but the problem is I do know the field which stores that the text in SAP B1 in order to design layout.

I want to display that the text in PLD but I do not know the field which I can use.

Please anyone can help me.