fix: overallocation on purchase order to multiple invoices (backport #37586)

[mergify]

This is an automatic backport of pull request #37586 done by Mergify.
Cherry-pick of 23df420 has failed:

On branch mergify/bp/version-14-hotfix/pr-37586
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	both modified:   erpnext/accounts/utils.py

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[frappe-pr-bot]

🎉 This PR is included in version 14.46.0 🎉

The release is available on GitHub release

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