Pick quantity is getting updated greater than delivery quantity via FM WS_DELIVERY_UPDATE_2

Hi experts,

I am updating pick quantity via FM WS_DELIVERY_UPDATE_2. For some of the line items of delivery the FM is updating pick quantity greater than delivery quantity.

For e.g. if pick quantity and delivery quantity both are 1 and if I execute this FM, it is changing the pick quantity to 2.

Please advice if some parameters I am wrongly passing to this FM. Attached the code I am using.

This is quite urgent.

Thank you.

Regards,

shadab