Sub-items not supported for selected item(s) error in LSMW

Hi gurus,

Am working on BOM's data load via LSMW. Most of the item are stock items (L) but some of the items i am loading are Text items (T). Because of the customizing done in OS13 (that can't be changed apparently), the LSMW executed in foreground gives the message "Sub-items not supported for selected item(s)" (only as information, green message) and the dataload IS STOPPED.

Is there a way to :

-> change OS13 (allow sub-items for text items) : When i try i have an error message.

-> or to force LSMW program no to go on the sub items screens (this way the program does not stop and the BOM is created)

Thanks in advance for your answers,

Olivier