Not able to send large data to ME SDP request Module

Not able to send large data to ME SDP request Module

I am using rest api to integrate the ME service desk plus with our product. But I am facing one issue while creating one record into request module of ME using Rest Api. 

Problem:- When I am trying to send less than 2400 character string into description field then its creating record into ME SDP , but for more then 2400 character not able to create record into ME SDP. 

                   I have tested my PHP-curl post method is fine but the ME is not accepting more than 2400 character for single field. So can you please guide me , whether there is something wrong from my side or Is this bug in Manage Engine. 

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