R3002Z1I - add lines to existing BOM

How to add lines to existing BOM using R3002Z1I.

I have used TNAC = C, it says Record Invalid.

Subject : Error: Record Invalid

CAUSE . . . . The record being processed either already exists for an 'ADD'

function or does not exist for an 'INQUIRY', 'CHANGE' or

'DELETE' function.

RESOLUTION. . If you are attempting to inquire, change or delete a record you

previously added, there may be data base problems in your

production library. You should notify your data processing

department.

What is the right way to do it?