WEbadi integrator mandatory columns

Hi

 We are using webAdi integrator for Advanced Pricing. normally users will create headers and download the webAdi template to enter the modifier lines. Business requested if we we can make indicate the mandatory fields with a different color. which will be visible in the excel (either with a yellow color, symbol (*) etc).

I can make the column as NOT NULL using the desktop integrator, however that will not solve the problem because after entering 100 lines when you try to upload the file it will give a message that this column should be entered. and again user should go ahead and make the changes.