When trying to create a new project using XOG, if both "associatedParent" and "fromTemplate" attributes are specified in the project XML, "associatedParent" is ignored. If "fromTemplate" is ommited, the project is created with the "associatedParent" set.
If you try to set a Parent to a project template from the Clarity UI, you will get the following error:
Error: Program/Template project can neither be a parent to other investments nor have a parent investment.
Release : 15.9.3
Component : PPMXOG
Create a new process to set this attribute after the project has been created to set its parent, or, do a second XOG call to update that attribute alone (i.e.: as a separate step, not during the creation).