LSMW IDOC method BLAORD03

Hello,

I'm trying to use idoc BLAORD03 to create lsmw for purchasing contracts (services).

I'd appreciate if someone could guide me on the structures to select and how the mapping should be done.

BAPI BUS2014 (PURCONTRACT_CREATE01) would've been my preferred option, but it doesn't have the ESLL structure.

Thank you.