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Individual user purchase order processing is controlled by a variety of variables, such as User account where the Account Filter and Role (and the Permissions assigned to those Roles) are defined for each user, User Preferences, Rules, etc. By default the system will give a warning if the budget's remaining balance will go negative. Remaining balance is either unencumbered balance or unencumbered balance - outstanding requisitions depending on whether the pre-encumbrance module is enabled and the specific rule(s) the district has enabled.
USAS supports outside purchasing systems containing requisition approval workflows. A Rule must be enabled if the district wants to use requisition approvals. Once the requisition is approved and converted to a PO, a "transmission status" is added to the PO (not visible to the user) so that the outside purchasing system can -R contains an optional module to provide support for the optional Classic USAS Requisition Approval functionality. If this module is enabled, a Custom Field will be available on the requisition to indicate it's status, and requisitions may only be converted to a purchase order after the status has been set to approved by a user with the appropriate security. This module also activates an optional "transmission status" Custom Field on the PO so that an outside purchasing system may optionally tell USAS whether the PO was already transmitted to the vendor.
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