Voluntary After Tax Contribution... Distribution

A single member business guy setup a plan (Solo) and rolled into the plan old pension money he had from when he worked somewhere else.  He is telling me some of the money is Voluntary After Tax contribution money... not Roth deferrals.  He took a distribution from the VAT money rolled into the plan.  Do you treat VAT distributions the same way you treat Roth distributions?

VAT would create a basis in the Plan. 

I'd ask for the 1099-R showing the non-taxable basis. I believe it would have been reported on Box 5.

The distributions coming out are generally required to be pro-rated between basis and earnings. 

Thanks!