Sorry about that, let me restart from fresh screenshot by screenshot.
When Click on this button:
I end up here. When I click on the 16 transactions on this line(which are sale invoices).
I see this:
As you can see all the transactions in this table have the same tax(which is not RCM) and they are either sales invoices or receipts.
Now Let’s look at the tax that I have chosen on this table(the one pointing top the red arrow).
As you can see in the below image, nowhere it shows the tax as RCM. The “tax type” custom field is just me messing around as I was trying to hide the data between parenthesis in the Name but it won’t work as I won’t see it on the reports.
Also here is an example of one of the sales invoice so you see how it is entered(below it becomes negative in the above table), the invoice 11119:
So, now I have given all the information, let me reply to your questions about:
Also, do I correctly interpret that you have created a line-item custom field called “Reverse Charge?” If so, why? What do you hope this will accomplish? How will you use it?
The reason I did that is because in the country where I live, the word “Reverse charge” most show in the invoice. I could not find a better way of doing it sorry. All I do is enable that box and write “Reverse charge” inside it.
The second question is:
We understand 100% your explanations of the transactions being negative when RCM is added to the customs tax and the tax used on Sales(we understand this perfectly now). But in the above examples, the tax is not RCM(customer, single rate, 18%) but still output all our sales as negative in the custom tax table. Unless both my wife and I missed something, we cannot understand the logic behind this sorry. And my apology if there is something very big we have missed or misunderstood in your previous explanations. We tried to show this to some of our friends but none of us understands it.