Professional Tax Deduction with multiple employers

Professional Tax of Rs.5440/- was deducted by 3 employers during the financial year While filing ITR, system is mentioning that "Maximum deduction of Professional tax u/s 16(iii) can be claimed of Rs. 5,000.". I am unable to fully claim the deducted amount. Can't we claim the fully deducted professional tax by the employers while filing ITR.