CRRZM0490E Device
Page cannot accept multiple physical pages.
Explanation
A physical page was attempted to be created on a device
page that already had a single physical page and did not specify the MULT=YES attribute.
User response
To specify that the device page can accept multiple
physical pages, select the device page in the outline view.
In the properties view, mark the Multiple
physical pages checkbox. The MULT=YES attribute
is added to the device page in the source and physical pages can be
added without error.