Making a surcharge in invoice

Is it safe if I add a surcharge to an invoice module? I’m not sure how to include it. Do I need to code, or is it customizable? I want to make an initial cash float too in invoice since sale_pos isn’t available in trytond 6.0.

Please explain what you mean. What is “surcharge in invoice”? What does it have to do with POS? What do you mean by “cash float”?

Sorry, I used the wrong term. “Surcharge” was supposed to be “rounding off an uneven payment.” For example, if the amount is 19,554, it would be rounded up to 20,000.

For “initial cash float,” it was supposed to refer to the initial amount of cash provided for giving change.

I could not use sale_pos, since it is unavailable module in tryton 6.0.

You can use the Account Cash Rounding Module.

This is a concept that exist only in the Sale Point Module.

You should upgrade otherwise you will have to develop the new module to this series.