With the help of T-code ME51N, a purchase requisition is created with the help of this process:
First, execution of ME51N transaction.
Then, arrange purchase requisition document type: NB
Now source determination: OFF or ON
Now enter heater note, material number, UoM, Quantity, and storage location.
Then, the vendor is automatically decided with source determination.
Now add the tracking number, valuation prices, and final save the transaction data.