Project ID in a Purchase order header level or line level- it is not possible, Project ID field is greyed out

There could be a situation in AX2012 when you have created Purchase order and saved it (Project ID is unknown in this stage). After that if you want to enter Project ID to a header level or line level- it is not possible, Project ID field is greyed out. The conclusion of this behavior is that this is how project Purchase order is currently designed: - The Project ID on the PO header shouldn't be editable when a PO header is created without a project. - The Project ID on the PO header...(read more)