Linking back to existing Activity

When creating Maps quite often there is a decision where one of the answers may link back to an Activity in the Map. It would be sensibl;e to npot only allow the selectrion of Activity but to allow the entering of the activity number so a loop can be created within the process. Eg

Activity 1 Run Prelim Depreciation

Activity 2 Review Depn

Activity 3 Fix Errors

Decision 1 Are there any errors ?

Yes - Back to activity 1

No - (carry On)