28 May 2019
You have 2 options: 1. you can reduced the amount (XYZ Company's invoice) from B2C and added it to B2B sale in the month of May-2019 or subsequent month. 2. You can issue a Credit note with the same amount which will be shown by you as URD sale XYZ Company's invoice) and then issue a new invoice in the month of may 2019 or subsequent month and mention this as B2B sale in GSTR-1 for the same month.
Thanks & Regards CA Shankit Sharma Mob. No. - +91-9079367736