Outbound idoc error - REFINT field

I am trying to send orders.orders05 idoc from ecc to xi

the message that I get in we02 in ECC is

EDI: Field REFINT in control record with value 'T080902134731A ' is invalid

Does somebody knows where this field is configured ?

when I edited this idoc in we02 and erased this value the process was sucessfuly

but when I try using we19 it assigns this value automatically

thx

Shai