Item & is marked for correction

What causes this issue?

The error reported previously cannot be corrected on the current
entry screen for technical reasons. Therefore, the item is marked for
adjustment.

System Response

Before the document can be posted, you automatically branch to the
respective line item screen to make the adjustment.

How to fix this error?

Continue making entries and then correct the specified line item.

Error message extract from SAP system. Copyright SAP SE.