Calling EditPromotion from WF leads to SBL-ISS-00703 error

Hello,

I am trying to call EditPromotion signal from wf.

In wf SIS OM Modify Products & Services, after the go to document step, I select in order entry - line items the promotion line and call in a bs step SIS OM PMT Service -> Invoke BC Method

with method EditPromotion for bc Order Entry - Line Items.

I can see in the log the signal being called, but it errors out with error:

Invalid input parameter(s). Unable to Edit Promotion(SBL-ISS-00703).

I have tried calling it from script, same problem or worse, the developer client crashes all together.