Hi,
I would suggest to run the standard report RMBESTK3 in Se38 and check whether there is any inconsistency. Also refer the KBA: 1672398 - Inconsistencies in statistic values of external service purchase orders - report RMBESTK3
If the issue is not resolved, please check the note: 2124033 - Error SE347 while creating release order.
Regards,
AKPT