remove Nonrecoverable tax line when not applicable

Summary:

When entering purchasing invoice the tax line generates 2 tax distributions: a Recoverable value as tax amount and Nonrecoverable value as zero.
Even though we have set the recoverable rate to 100%, so why dose system always generates Nonrecoverable tax line?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):