Please help

its called endorsement of payment, but it can be done either for full amount or zero, partial endorsement can not be done.

Dear U S Sharma

Can you give me the section, where its mentioned

its banking rules, not of incometax

U S Sharma Jee mere CA ne bola ye transaction Income Tax main Allowed nahi hai.

true, partial endorsement is not allowed.

when mills send goods direct to manufacturers, under their invoice, they endorse bills in favor of agents to collect payment and the transaction is 100% endorsed, 

so either 100% endorsed or zero 

also it needs some stamp paper to endorse, ( in business language its called hundi)