* test: payment entry over allocation.
* fix: validate allocated_amount against latest outstanding amount.
* fix: payment entry get outstanding documents for advance payments
* fix: only fetch latest outstanding_amount.
* fix: throw if reference is allocated
* test: throw error if a reference has been partially allocated after inital creation.
* chore: test name
* fix: remove unused part of test
* chore: linter
* chore: more user friendly error messages
* fix: only validate outstanding amount if partly paid and don't filter by cost center
* chore: minor refactor for doc.cost_center
Co-authored-by: Deepesh Garg <deepeshgarg6@gmail.com>
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Co-authored-by: Anand Baburajan <anandbaburajan@gmail.com>
Co-authored-by: Deepesh Garg <deepeshgarg6@gmail.com>
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