Hi,
In MFBF transaction you are trying to post the confirmation of finished good material.
As we know in MFBF, we do confirmation through backflushing wherein component materials required for production of finished good material get consumed or backflushed and auto GR of finished good material also done by the system.
Now in your case, BOM components quantity required for finished good material production are not in stock hence system is giving error as 'Missing BOM components' and without BOM components how can you post or do production of finished good material.
To resolve this issue, first you need to bring all BOM components into stock through purchase or production whichever is applicable on the basis of their 'Procurement Type' in Material Master MRP2 view.
Regards,
Naresh