Assign the Equipment to the Requisition Note in ETM Planning Board

Dear All

When I am trying to assign the equipment to the Requisition note I am unable to do the below step as per SAP documentation.  Unable to do the drag and drop the Requirement to Equipment.

Transaction Code: /SAPCEM/PT01  (Graphical Planning Board - Change)

"Select your Requirement and assign it with drag and drop to Equipment used in step 4.1.2 one day after the document date of the first shipping document created in the prior step."

Please advice me how to assign the requirement (Requisition note) to the Equipment.

Best Regards,

K. Rajendra Prasad Rao