WS20000075: work item of 1st release step stays in status In process

Hi All,

I have activated and set up standard flow WS20000075 but the work item of 1st release (PO release strategy with 3 levels) step stays in status In process. The work item for the 2nd and 3rd release step are completed as expected.

What could cause only the work item of the 1st release step to stay In process?

Thanks a lot in advance