udf for rfc lookup

hi, by using grafic rfc lookup it is possible to have more than on value as the result

so one lookup can return the value for n target fields.

but there is no way to prefent the lookup call even if it is part of an if/else .

i will execute the lookup only if source field has the right value, so i try to use the lookup api in a udf function.

but the problem is that there could by only on return?

Any idea how to fix this?

Is there a way to set the total Inputstream of the lookup to the return string?

regards

ralf