Cancel Regular Tax Line with Offset Tax assigned

Summary

Unable to Cancel the regular Tax Line with offset Tax assigned

Content

For Acquisition of services in Switzerland where the suppliers are not based in Switzerland, we are using tax rules to apply regular tax code (+7,7%) associated to the Offset (-7,7%) in AP. I am trying to cancel the regular tax line (+7,7%) using the 'Manage Tax Details', but I receive an error when clicking the 'Save' button (see error attached). It only happens to cancel regular tax lines with offset tax associated.

Can you share your experiences? Do you know how to cancel Tax Lines associated to offset Tax lines in AP after 'Calculate Tax'?.