In my opinion at the "Purchase and Paybales Setup" the field "Link Doc. Date To Posting Date" behaviour should be exactly the opposite of what it is.

The usual way is when we receive the vendor invoice we considerer the sames "Document Date" to post it, otherwise we input the posting date manually.

Right now if the company wishes to post a document using the posting date exactly the same as the Document Date, must choose bettwen theses two (bad) scenarios:

1st option) Activate the field "Link Doc. Date to Posting Date" and fill at the field " Posting Date" the document date . This will be a problema if in case of a specific differente situation they want to post an old document in a different posting date. In this situation they must fill the document in the opposite order

2nd option) By default leave the posting date empty at the setup and then at each document firstly fill the "Document Date" and afterwards the "Posting Date" . Not a friendly use

The best option should be that the user fill the "Document Date" , the "Posting Date" assume the same value, and only execptionally the user should change that posting date (if it was an old document)