Remove auto default storage location in material overview

[jukromi]

Hi all,

we have this problem at CJ20N (PS) screen.
At activity level, componenent overview, if user keys in the material no, a storage location is auto-defaulted

later we found out that if the material is extended to only 1 storage location, the storage will be auto-defaulted at componenet overwview, is there any setting to prevent the auto-defaulted storage .. pls advice