Z implementation not getting picked for BADI - MB_DOCUMENT_BADI

Hi,

I have a done a z implemenatation for standard badi MB_DOCUMENT_BADI in ECC6.In Tcode MIIGO after giving 2 line items when i save it that Zimplemen is not getting picked.

In 4.6c the same Z implementation is getting picked.

can you please help me out in this.