How do I amend the postage charge on an invoice..have tried twice and wont recalculate using the new postage charge

[tiddles3693]

i have recently sold an item and the postage wasnt as much as I thought. So I have gone into the invoice to amend the postage charge but it wont let me, when I press recalculate it defaults back to the original postage charge..how do i change it before sending the invoice

thank you

[kopenhagen5 · Accepted solution]

Do not click re-calculate, just send. Or you can preview to check it before you send. Re-calculate reverts it back to original.