Multiple assignment of a line ID

What causes this issue?

An item table, in which the line ID (LINE_ID) is not uniquely filled,
was transferred to the function module MB_CREATE_GOODS_MOVEMENT.

System Response

Processing is terminated.

How to fix this error?

INCLUDE NA_SYSTEMVERWALTUNG

Procedure for System Administrators

There is an error in the calling application.

Error message extract from SAP system. Copyright SAP SE.