ABAP mapping rfclookup multiple times

Hello,

My interface looks something like this:

XML Shipping Notification >--- Web Service > PI Mapping > IDOC adapter --> ECC IDOC

With my ABAP mapping I'll need to create a UDF to pull data from ECC into 12 fields on my IDOC. I'd rather not run the UDF rfc lookup in 12 seperate instances. Is there a way to pull in all the data I need one time and then pass it into each field as required?

Some kind of temporary storage from one run of the UDF?

Thanks,

Matt