Callback Workflow error for contract

[#1]

Hello all,

We are using flexible workflow for contract approval  and was working fine till last week. Recently I setup the badi wfl restart where on valid to field change the workflow will not triggered. After this implementation the workflow is going in error post approval by the user. The approval status of the contract gets stuck in Error in workflow processing. I them deactivated the restart BADI and the problem is still there. There are no logs or dumps occuring anywhere. I checked in SWIA there is a result_callback method on which the error is occuring. No SAP note is revelant in our case. We are on S4 HANA on premise 2023 version.

In the technical details I found this error, but it does not make any sense to me:

SWF_FLEX_RUN

Message no : 84

Error while executing application callback (Method 'result_callback')