I have revceived a planning area complete with planning level, package and layout. When I want to enter plan data, I get the following error message.
"The environment has changed; the layout can no longer be executed"
In order to try to re-generate, I opened the layout and planning area, level, package in change mode, then saved but it was no help.
This error comes when you have done some changes in the first or second screen of the mannual planning layout and have saved before going into all the screens of the layout design. You should save it at the end of the mannual planning screens.
So go to the mannual planning layout and click the continue button twice and save it .
Hope this helps...