Using FLB1, when FB05 is called Doc Type is not defaulted

When starting in FLB1 to apply cash from my lockbox, when I process a check that has come in on account, I chose Select Account. 

This calls FB05.  The document type on this screen is blank and required.  Is there a way to default in a specific document type here.

I have created a transaction variant throught SHD0 for FB05, and that populated the document type if I call FB05 directly, but when it is called from FLB1, the document type is not defaulted.

Any help would be appreciated.

Thanks,

Gerry