User exit for tcode vf11

Hello everyone,

I request to find an idiosyncratic exit for transaction vf11. The request is that I request to fetch the fig of the recently created billing papers fig and prevention it successful a Z table. The occupation is that I person seen the forum and immoderate of the suggested idiosyncratic exits, but successful each of them the tract vbkrk-vbeln is not yet filled. 

May anyone cognize specified an idiosyncratic exit?

Thank you and regards,

R