Posting commission in a sales invoice

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as i understand in software we must book sale invoice as credit sale alongwith commission paid amount so entry will be-

let suppose

ABC (Dr)Rs1900
Commission Allowed(DR)Rs 100

to Sale Account (Cr) Rs 2000
________ _______
2000 2000

if you did not post the commission at the time of sale on cash and now just want to post commission on sale of Rs. 100 the the entry will be-



Commission Allowed Dr Rs 100
to Cash or bank(Cr)Rs 100
Commission paid to ABC on Inv NO......dt....

IF THERE IS ANY MISTAKE I WILL APPRECIATE TO CORRECT ME TOO. THANKS