What is 'Line item vat amount and total must both match positive or negative'

[Miri]

I am trying to submit line item with minus amount in Invoice, and this message showes up that doesn't let me continue editting, 

I want to know what this message means and how to save with minus amount.

[TriciaW]

@Miri Hello.  I have reached out to our Invoice team with your questions.  I will respond back once I have some information to share.

Remember to tag me if you respond or feel free to mark this post as Solved if you don't have further questions or comments. To tag me on your response, you click the Reply button, first thing to type is @. This should bring up the username of the person you are replying to.

[Miri]

@TriciaW 

That is very helpful of you  to do so.
I will wait for their response.

[TriciaW · Accepted solution]

@Miri Please see the response back from our Invoice team.  The system does not allow a combination of positive and negative amounts within the same line item. If a line item is for a positive amount, all amounts entered on that line item, such as VAT/tax amounts and allocations, need to also be for a positive amount. And if a line item is for a negative amount, all amounts entered on that line item must also be for a negative amount. When an invoice contains positive and negative amounts, they must be entered as separate line items.

I hope this is helpful.

[Miri]

@TriciaW 
I added - before the Tax amounts with negative Amount and the alert has gone !
Thank you for your help.
I appreciate it !