Error in BOM structure for material &

What causes this issue?

When creating a material document, the system determined that a BOM list
structure is incomplete.

System Response

The entry quantities of all components of the specified material number
have been reset.
Inconsistent components in the structure were reset to zero when the
entry quantity was changed. Relevant lines are not copied in to the
material document.

How to fix this error?

Check that the inbound data used is correctly maintained and used. You
can now adopt the data.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.