Fix permission error and add totals

Description

fix: permission error for doctype
feat: add subtotal and total row

Fixes https://github.com/dvdl16/csf_za/issues/7 Fixes https://github.com/dvdl16/csf_za/issues/4

Type of change

🟢 Bug fix (change which fixes an issue)
🟢 New feature (change which adds functionality)
⚪ Breaking change (fix or feature that would cause existing functionality to not work as expected)

Tests

[ ] Unit Tests have been updated or added, as required
[ ] UI Tests have been updated or added, as required

Checklist:

[x] My code follows Naming Guidelines (DocType, Field and Variable naming)
[x] No Form changes / My code follows the Form Design Guidelines
[x] My code follows the Coding Standards of this project
[x] My code follows the Code Security Guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas / No comments necessary
[ ] I have made corresponding additions/changes to the documentation
[x] All business logic and validations are on the server-side / No business logic or validation changes
[x] No patches are necessary / Migration Patches have been added to the correct subdirectory of /patches and patches.txt have been updated

User Experience:

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 61.82%. Comparing base (74e8471) to head (b1d74d3).

Files	Patch %	Lines
...ions/value_added_tax_return_linked_transactions.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## version-15 #8 +/- ## ============================================== - Coverage 62.16% 61.82% -0.34% ============================================== Files 8 8 Lines 185 186 +1 ============================================== Hits 115 115 - Misses 70 71 +1 ```

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dvdl16 / csf_za

Fix permission error and add totals #8