If at the time of creating purchase bill software is asking challan no so this issue can be disabled:

In order to disable this window, the user needs to follow the given steps:

• Firstly, Go to Masters >> Marg Setups >> Control Room. Press Enter.

• A Control Room window will appear.

• The user will select ‘Search in all’. Press Enter.

• A Controls window will appear in which the user will Search “Challan No”.

• Now click on ‘Accept’

• A Challan No window will appear. 

• In 'Ask book field as Challan No', the user will select 'N'.

• The user will now press Escape key twice.

• Now click on ‘Yes’ to save changes.

Thereafter the software will not ask for the challan no at the time of creating purchase entry.