Add P_ORIG_SYS_DOCUMENT_REF to order payment

This PR adds a missing call to setP_ORIG_SYS_DOCUMENT_REF() in OrderPayment.

(I wish Intellij had shown parameter names in function calls earlier or I wouldn't have missed this so many times.)

Please review: @ahoffmann @weizhong-wang @lloyd-carter @KJOYNER

Merging for @lloyd-carter's testing.

mentioned in commit 622ec608

merged