Material & is not copied from the bill of material.

What causes this issue?

When the <GL:bill_of_material>bill of material</> was exploded, it was
established that no sales document item could be created for material
&V1&.

System Response

The system ignores the material during <GL:BOM_explosion>bill of
material explosion</>.

How to fix this error?

Check if the BOM explosion can be used without material &V1&. If not,
delete the main item which lead to the BOM explosion. You may be able
to enter an item manually in which the material &V1& in the BOM is
replaced.

Error message extract from SAP system. Copyright SAP SE.