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Problem in changing structure used in Custom (Z) BAPI

Hi Guys,

I have created a Z structure and used in Z BAPI and created BAPI in SWO1.

I have replace a numeric field with character field and also changed the field name. When I check (Ctrl + F2), it gives me RED error:

BAPI-structure: invalid change: field WORK_CTR should be deleted.

WORK_CTR is old field name.

WORK_CNTR is new field name.

It is also not activating, if I try to activate with errors.

How should I go about to change this BAPI structure.

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