re: pcs production integration
If I understood your question right, you could use the following solution:
In the session tipcs0503m000 (default project data by number group), you can enter a project for your integration mapping scheme.
Example: Create a "dummy project" in PCS, and leave it with status free (lets say you name it "project". Then start session tipcs0503m000 and make a record for your project series. In the field "project for mapping scheme", enter your dummy project and save.
Then in the integration mapping scheme you can use your dummy project as a project key element with the ledger account you want.
All PCS projects based on the series you have related to your dummy project will now go to the ledger account specified for your dummy project. Hope this helps you out.