So far, we are getting the work release sometimes after the completion of work but we start the work with some verbal communication or through mail..
During such situations, we may order some equipment to be supplied to the client place..
I don't see a problem with this
unless your quality system (procedures/policy etc) forbids work to start without a work release. Consulting/project firms often start work before the formal stuff is signed off, because usually the client wants it to start yesterday if not the week before.
Email/verbal release etc is often enough to go ahead - it's a business decision whether to accept this or not. IF it's considered OK (ie, not explicitly banned in your system) I might want to check that there's some note of that in the system (eg, pending receipt of formal Work Release?)
once it reaches they may change their requirments and again we have to replace it with some other equipment with their amended specifications for which we are not charging anything ..
sometimes, we cant order the client to say unless u give me the work release ,i cant work.. it is not practical..
I understand the impracticality requirement. The auditor has a point I think - it's a risk, which he's highlighting. That's reasonable. It's a management consideration what to do about the highlighted issue, no? ie, you / management may consider the finding and decide it's a risk that's still worth taking, because the alternative is annoying the hell out of too many customers and losing work.
BUT you do have to have ways of ensuring that if requirements changed between 'go ahead' and the formal Work Release, that you can identify that and fix them so they are correct.
but auditor asks me to amend the procedure or contract requirements for which client wont agree..
Sounds like he's made a recommendation or a suggestion (that's what I'd treat them as, unless as I said, there's something specifically existing in your system that you are not doing/breaching). Recommendations are opportunities to think about what you're doing - his viewpoint is different. Fine. Up to you to consider and decide whether you accept it or not, and why.