Custom tab not reflecting in ME21n,ME22n

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Hi friends,

I am working in one requirement ,to Include one custom tab in ME21n/22n/23n (header level) ,in that tab i need to add some three custom fields YYAA1, YYAA2, YYAA3 .For this development i have used ME_GUI_PO_CUST and ME_PROCESS_PO_CUST. in method SUBSCRIBE of ME_GUI_PO_CUST i have written the code which is same as example code for that method .

And also I have created all relevant function module as per the sample code ,for remaining methods.

and for BAPI ME_PROCESS_PO_CUST in method INITIALIZE i have written following code which is also same as it's example code.

METHOD IF_EX_ME_PROCESS_PO_CUST~INITIALIZE.

CALL FUNCTION 'ZMEPOBADIHE_INIT'.

ENDMETHOD.

Now my problem is

1.Custom tab its not getting displayed in ME21n & ME22n but it getting displayed in ME23n.

Could any one help on this ?

Thanks in advance,

Regards,

Ram.