Structure errors for material & still present. (See long text)

What causes this issue?

An analysis of the document lines showed that there are still structure
errors in material &V1&, even after corrections have been made.

System Response

Inconsistencies like these may not be posted.

How to fix this error?

When you <LS>Save</> again, all inconsistent document items can be
checked. The inconsistent items can be reset to entry quantity zero
automatically, or you can do it manually. The total document is only
posted when all items are consistent.

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.