Workflow has error ERP 5.0

Dear all.

ERP 5.0

I have a problem into workflow.

For begin, I have created simple branch task, with one call method ‘Z*’ function module.

This workflow has object type BUS2032 – Sales order, event - DELETED.

Checked and activate without error.

Next, I go to tcode VA02 and deleted one order.

next, in tcode SWI2_FREQ, shows following error:

I tried finding solutions on sdn but couldn't find any matching my exact scenario so decided to post.

Any inputs on this would be really appreciated.

Thanks in advance!

Regards,

Mykola Chekalov.