Please read OSS Note 401318 - Archiving: Additional information
it explains that it is SAP design that requisitions from PM orders get archived together with the PM order.
and OSS Note 1647351 - PReq archives even though PS or PM order still exists
fixed an error and restricts that such requisitions can be archived with MM_EBAN.
Unfortunately I have no information about ALO1 display of such requisitions.
Hope somebody else has some info for you. Otherwise you may need to contact SAPs service desk. Please share when you know the answer.