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When using the Amend option on a Purchase order, you are not permitted to change the Vendor if the PO has already been invoiced/paid. You will also not be permitted to modify an existing item if that item has been invoiced./paid.
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 installed (see Admin/Modules) and on the specific rule(s) the district has enabled. However, this can be customized to suit the needs of the district (see rules org.ssdt_ohio.usas.model.po.DefaultBalanceCheckWarning and org.ssdt_ohio.usas.module.preencumbrance.POBalanceCheckWarningExcludePreencumbrances).
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