We have been having a recurring issue with a specific item posting to the "invalid" clearing account 99990000. When this happens, we are unable to finish posting until the entry is fixed through GL-P (Edit GL). I have researched the item to find out why this keeps happening & have traced it to a part #, which has an item class code of PACR. The PACR class currently only posts to account #51100000 (packaging expense) with the offset as account #99990000. In order to prevent having to edit the GL each time this part posts, I can edit the Item Class GL in SM-C, so that the offset would be 43160000 (LED COGS). I was able to do this before, however, when I try to do it now I get the "Cannot Save" message, Any Ideas??