Field help (PIHCCE) 

These are the analytical dimensions initialized based on the setup of the default dimensions (PIH dimension code). These dimension codes can be modified manually if authorized by the transaction.
When an analytical dimension is used for project management tracking, any modification of the project code on the document header leads to the dimension code being reset based on the Default dimensions setup. If the project code is used onto the lines, the dimension code of impacted lines is also reset.