In MB5B we found negative initial stock for some articles.
The articles are AFS with split valuation. In this context we should have in MBEW one record for valuation type blank, plus one record for valuation types 1 - 2 - 3 and so on. Now I expect that valuation type blank holds the total sum of each other valuation type (ie. 30 in val type blank can be distributed to val. types 1 - 2 - 3 as 0, 18, 12).
When we find a new article with negative initial stock, instead, we have a difference in MBEW between the val. type blank and the others. Checking material documents we don't see any possible mistake - valuation types and stock categories are correctly filled. We also tried to find change documents for the material master, but the material has been created correctly and never modified.
What else could we check? Anyone else had the same issue with AFS?
Thank you for your help