During installation a Security Task will be created called BLANKETPO. It will have access to all windows in the module.
The installation will also create a Security Role called BLANKETPO, and assign the Security Task to the Role.
To ensure that users have access to the windows required by the Blanket PO Module, you can:
Assign the BLANKETPO Security Task to an existing Role, or
Assign the BLANKETPO Security Role to one or more Users
It is important to not modify the BLANKETPO Security Task. When updates for BPO are installed they will rebuild the Security Task to ensure it is configured correctly, and any changes will be overwritten.