Fake invoice treatment in gst act

a gst registered dealer purchase of goods invoice value rs:4 lacs dt:10-10-21 from another registered dealer.
if dealer purchase of goods after sales of goods value rs:4 lacs dt:10-10-21 to another registered dealer.
question:
above purchase and sale transaction same date and same value treatment fake (bogus) treatment in gst act.
2.dealer above transactions turnover increased purpose.