Hi!
I have searched and saw this warning in some forums:
"User may try to post to a storage location which is not already extended in MMSC, in that case the system issues a warning message and allows to proceed. Check and revert back."
However most of the texts says that it is only an extension in material master.
Try this test: post some material in a storage location for which this material is not extended. If you do not have errors, then check the material in MM02 (use hierarchy level and type the "new" storage location). If it is extended to the new storage location, all should be working for any purpose (SD, MM, FI...).
Rgds,
Marcio
