fix: Validate Subcontracting Order when Unregistered Supplier

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.94%. Comparing base (f7d5f8c) to head (4a1826a). Report is 4 commits behind head on develop.

Additional details and impacted files

[](https://app.codecov.io/gh/resilient-tech/india-compliance/pull/2743?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=resilient-tech) ```diff @@ Coverage Diff @@ ## develop #2743 +/- ## =========================================== + Coverage 59.77% 59.94% +0.16% =========================================== Files 122 122 Lines 11976 11976 =========================================== + Hits 7159 7179 +20 + Misses 4817 4797 -20 ``` | [Files with missing lines](https://app.codecov.io/gh/resilient-tech/india-compliance/pull/2743?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=resilient-tech) | Coverage Δ | | |---|---|---| | [.../gst\_india/overrides/subcontracting\_transaction.py](https://app.codecov.io/gh/resilient-tech/india-compliance/pull/2743?src=pr&el=tree&filepath=india_compliance%2Fgst_india%2Foverrides%2Fsubcontracting_transaction.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=resilient-tech#diff-aW5kaWFfY29tcGxpYW5jZS9nc3RfaW5kaWEvb3ZlcnJpZGVzL3N1YmNvbnRyYWN0aW5nX3RyYW5zYWN0aW9uLnB5) | `76.38% <100.00%> (+8.33%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/resilient-tech/india-compliance/pull/2743/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=resilient-tech) [](https://app.codecov.io/gh/resilient-tech/india-compliance/pull/2743?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=resilient-tech)