Below is the log header:
tdsls4534s000 - Sales Order Line Status: Application error in session tdsls4534s000: Wrong use of DAL Engine ('unreachable' failed): something wrong with the last Database Transaction.
File: ittstpdaltbl0 (line 2266).
DB error 100 on table cisli812 in company 800 (Max retries (10) exceeded)
The point is that there is no duplicate value in cisli812 (DB error 100) and everythig is random. After a while (but it may take days) the relese to invoicing will work without problem. Moreover I suspect that the sales order line status can not be updated, but I don't know how to check this.
Thank you for your help,