@ronhu I m not sure if I got the question right. Customer No filed can be edited using the LoV. If the same company is registered as customer and supplier, it is possible to make the connection by selecting the customer from the LoV.

Hope this helps !

@ronhu not sure if the below screen also exists in your Apps version (9 / 10):

If it doesn’t exist then I think the only way to see this info for more suppliers would be by creating a Quick Report.

@Buddhika Kurera 

@Marcel.Ausan 

Thank you.

For the benefit of future visitors :)

It seems like the Customer No is not available in Purchase Specific Information overview, even though the window exists. So the solution is a quick report.

@ronhu Please mention if you sort this out in a different way, thanks !

@Buddhika Kurera Thank you. I realized the Customer No is not Our Customer No.

I just did a query builder, it is available in the query builder view. thank you.