Error while creating PI document while running exception code in RFUI

Dear Experts,

I am trying to test a functionality of PI document creation while running exception code ( full pick denial or partial pick denial) if work fine last week. last week i enhanced the configuration and added check mark to block BIN once this exception code executed.

After that i can see its working in few cases but in few cases its not. For the test where the P:I documents are getting failed i can see below work flow related error. I tried to compare product as well as BIN details between the data for which its working and for which its not working but not getting any clue.

Appreciate if you could help with your thoughts and experience here. Below are the images from workflow.

Thanks

RD