Hi,
can you please check what posting keys are given OBYR for vendors and OBXR for customers and double click on desired Special G/L indicator and click on Image may be NSFW.
Clik here to view.and then click on
Image may be NSFW.
Clik here to view.
In this case check whether your special G/L has been assigned with the posting keys as required by you. Above we have given an example in your case it may be different.
Hope, this solves your issue else feel free to revert.
Regards,
Tejas