Data incompatibility when passing a deep structure

Hello Experts,

I am facing an issue

I'm trying to pass xvbak from a standard program  to a class method

the formal parameters are defined as

DATA: BEGIN OF xvbak.             
              INCLUDE STRUCTURE vbak.
DATA:       bstkd                LIKE vbkd-bstkd.
DATA:       kursk                LIKE vbkd-kursk.         
DATA:       zterm               LIKE vbkd-zterm.        
DATA:       inco1                LIKE vbkd-inco1.

DATA: END OF xvbak.

When i try to pass XVBAK to my class method i get a data incompatibility error  between CS_XVBAK and XVBAK. although both are types to the same set of fields.

CALL METHOD Object->DETERMINE_customer 

     Changing

               CS_XVBAK  = XVBAK

This is how CS_XVBAK (Actual Parameters) have been typed inside my class as a changing Parameter.

types:

     BEGIN OF GTY_XVBAK,
            p_vbak type vbak,

            bstkd TYPE vbkd-bstkd,
            kursk TYPE vbkd-kursk,         
            zterm TYPE vbkd-zterm,        l
            inco1 TYPE vbkd-inco1, 

     END OF GTY_XVBAK .      
               

Changing Parameter: 

Data: CS_XVBAK type GTY_XVBAK.

Is there an issue with the above code?... Im just wondering if the include structure in both declarations is the cause of the issue?

Is there a correct way of making 2 deep structures compatible?

Any help will be highly appreciated.