1: create an invoice register with tax included.

2: post the invoice register.

3: create an invoice approval. retrieve the tax register in step 1.

4: if customer identity the tax information again in the invoice approval.

system pop not balance issue. in fact, if the invoice set with tax excluded. there is no issue if customer identity the tax information again in the invoice approval.

The new idea here: system should follow the behavior as excluded tax. user can identify the tax information in the invoice approval if the invoice register with tax included.