deductible expenditure?

Whether allowable, or not ? The thing is under section 37 any activity carried out in normal course of business and is contributing to revenues and is pertaining to business is allowable. Where you're taking consultation from some outside consultants, in due course of business and paying fees for geographical prospecting/exploration, the amount paid will be allowable. 

Now as far as salary is concerned, are you sure you're paying salary to them ? Aren't they on the payroll of the the client , so salary should be payable to them. The classification instead should be reimbursement of expenses, and that should be the head under which you classify these expenses in your company. Essentially, the client is claiming their employee is working for you and in course of consultation/work, the expenses they incur will be payable by you. 

That probably should be the classification. 

thanks dhruv

Thanks so much for the reply.... yes we r paying salary to the employees and they r on payroll of client and my doubt is related to classification TITLE  i.e if i write 'reimbursement of expense' as under administration expenses in P & L A/C will it be correct?

If you've employed a technical consultant or a professional consultant, classify is under legal and professional fees and have two subheads under it : 

-Consultant Fee ( this is the actual fee you're paying to them for their services)

- Reimbursement of Expenses  ( the amount you're paying on their behalf, salary, hotel stay charges etc. )