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EASA Part-21 Sub-G
Yes, but under specific circumstances as detailed below.
There can be multiple items on a EASA form-1, but it must be related to a work order. (Both examples below come from a 21G).


For EASA Form-1’s issued by Part-145 organisations it is allowed as well as long as it is also related to the same work order. See example below for details of different part numbers on an EASA Form-1 related to the same work order.

It is not allowed to mix EASA Part-21G produced parts with EASA Part-145 maintained parts on one EASA Form-1.
No, there are no formal requirements in the EASA Part-21 or -145 regulations requiring physical separation of Part-21 stock items from Part-145 stock items.
What is important, is that the Part-145 may only use parts listed in the IPC/IPL. Part-21 can use items for proto types or from drawings. These parts should not be issued in a Part-145 environment.
The parts or items in the shared stockrooms must of course be provided with batch numbers, locations, etc. The entire trace and end-use (Part-21 and/or Part-145) must be recorded in the ERP.
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