Deactivate custom tab

Hello Experts,

I have created a new custom tab at item level in ME21N/22N/23N using ME_GUI_PO_CUST and ME_PROCESS_PO_CUST badis.

But this tab has to be activated for only specific condition. The condition has to be checked based on header data in LFM1 table.

Usually in ME_GUI_PO_CUST BADI, in subscribe method we activate the tab but I am unable to retrieve header data in the method.

So, can anyone help me out on which method do we need to handle and how to do this?

Appreciate your inputs.

Thanks!

Sandy.