Simple issue with a RRI to ME33K, contract display.

I am trying to build a RRI to ME33K which is the contract display screen.

Within RSBBS I have created the RRI to the transaction and

I have entered the following under detailed assignment:-

InfoObject: 0Contract

Type: 3 Table Field

Field: EVRTN

Selection Type: Single entry

Required Entry: ticked

Data Element : EVRTN

Domain: EBELN

The RRI takes me to the correct mapping but the contract number is not being mapped across. Could this caused by the fact that The field that is being mapped to is a structure or am I missing something obvious?

I am also assuming I don't need to use the user exit mapping as this is a direct one-to-one mapping ?!?

Any suggestions would be greatly appreciated.

Many Thanks

Shep