Hi there ,

Journal entry for this transaction in books of Bharat will be following:

Ajay A/c Dr. 15000

To sales A/c 15000

Bills receivable A/c Dr. 15000

To Ajay A/c    15000

Cash A/c Dr. 15000

To bills receivable A/c 15000

Journal entry in books of Ajay will be following:

Purchase A/c Dr. 15000

To Baharat 15000

Baharat A/c Dr. 15000

To bills payable A/c 15000

Bills payable A/c 15000

To cash A/c 15000

Hope it helps you.

Good luck!