English to German Bus/Financial Accounting

In a services agreement, there is the following sentence:

"A shall pay B fees equal to B’s direct and indirect non-duplicative costs for Services performed by B that benefit A [...]

direct costs = Einzelkosten
indirect costs = Gemeinkosten

But what does "non-duplicative" mean? That A cannot charge B twice (double) for the "same" costs?

Thanks for your help and ideas!