Output type not accepting Comm method 5 - External send

Hi

not sure whether this should be posted on the Abap forum or on here ???

I have a shipping output type.

assigned Partner functions and applicable mediums - 1, 2 and 5

however when trying to produce ooutput via comm method 5, external send, i am gettting red error messages/ traffic ligh

processing log is as follows:-

"processing log for program xxxxxxxx routine ENTRY

Please enter an address number

communication type cannot be used"

all outputs for medium types 2 Fax and 1 print are all OK for all Partner functions involved

please could someone provide our Abapper with the missing coding that is needed to accomodate the External send functionality

Many thanks for your help on this matter

Tony