Advance to a Customer - peculiar case

Hi Friends,

This is my first question.

I am facing a peculiar problem.

One of the main customers of our client requested to get his roads repaired as it is becoming difficult for transporting purposes with client's money and he promised to repay that when he makes next payment for his purchases with the client. And now, the third party who is doing the work wants advance payment. How to make advance payment to this third party and how to collect this money from the Customer. Simply saying, the advance payment amount what we are paying to the third party (who is repairing the roads) should show against the customer so that we can claim from him. Hope i have explained the situation well. Please ask me for clarifications.

Thanks in advances

Regards