Time offset for BPC data using BEx

Hello BPC experts!

We are trying to consume a BEx query into Design Studio using BPC data. Since the time dimension in BPC is stored as a character, the native offset functionality in BEx does not work. Are there any delivered Function Modules that can provide the conversion for the BPC time dimension or is the only way to create a user exit for each offset year?

We are using BPC 10.0 SP12 on BW 7.3 SP8 and Design Studio 1.3.

Thank you very much,

Nikki