Using API Material Documents - Read, Create for Reversal

[nitin_desai_c79]

Hi Experts,

We have activated API Material Documents - Read, Create

Thru' external system this API is used to perform Goods Issue (261) & Goods Receipt (101) seamlessly.

Now, we have scenario to perform reversal posting using same Standard API service. However, we get this message

Payload used

URL 

It works fine for 261 

Does anyone have suggestions

Regards

ND