agvtool used in workspaces

Suppose the directory structure of my project is

• Apps.xcworkspace

• App A (folder)

  • A.xcodeproj

  • ..

• App B (folder)

  • B.xcodeproj

  • ..

A and B project (should) use both versioning. Unfortunately, this does not work (out of the box).

Only when changing the directory structure to

• Apps.xcworkspace

• A.xcodeproj

• App A (folder)

  • ..

• B.xcodeproj

• App B (folder)

  • ..

automatic version incrementing works.

Is there a possibility to make also the first version work?

PS: I am using a script that is called at the end of a successfully finished build process containing only one line:
`xcrun agvtool next-version -all `

PPS: In the man pages is mentioned that agvtool is to be started in the folder where the project resides but how can I do this for each project in the workspace?