EDI envelope error

pathName=/GS/GS08, errorCode=DT-STR001, errorMessage=[ISC.0082.9293] No matching choice value. I have set up all pick lists for GS records. Can someone tell me where I might have missed to correct this error :?:

Check GS08, see if the value in the 8th field after GS has a valid value in your pick lists.

Thanks for your reply. Yes there is a value in that position of the GS08 record. Its the version number 005010UCS. I add this value to the pick list for all the …HEADERS documents under GS08 in packages WmEDIforTN and WmEDI