Hi
We ran into this one on the Production forecast a while back
NAV uses an integer for the line number and increase the number in jumps of 10 000 to allow you to insert lines in between (Up to 9999 lines)
What it is saying is that it is trying to add another line but there are no line numbers left as the integer variable cannot go higher than that number (An integer can only be so big)
What can cause this is if you have a physical inv journal with more than 214748 lines on the one journal,
How it caught us though even though our journal is not that big was that we had a journal that was really big, when we posted it it left 1 record on the end with a really big line number, the system then added more lined carrying on from that line number, until we ran out of line numbers
The solution is to ensure that the journal is completely empty (No semi blank lines left over from the previous run) before you run a new journal, on the other hand if your journal really does have more than 200 000 lines you should split it into different batches
Cheers
Nev