P31114 Error when performing blind backflush material

Hi all

I hope someone can help me

I am setting up the manufacturing process for outside operations,

I have a route with one operation and a bill of material for parts that are sent to the supplier, this parts are backflushed at completion by P31114.

But when I am running P31114 and call the blind execution of the P31113 I receive the following error:

Sometimes I dont  receive the error and the work order completion is correct.

I tested the same scenario but instead of call a blind execution of the P31113, I am calling it in interactive form and I don t receive any error.