Android Alpha/Beta Testing: Upload failed You need to use a different version code for your APK because

I know how change the version code. My question is other:

I'm in Alpha Testing because i'm testing in-app purchasing and I need to do a lot of adjustments, try several products, etc. Any solution to avoid change any time the version code and number? This requirement is understandable in the Production environment but in an Alpha/Beta environment some people need to a lot of changes.