CopyValue multi mapping

Hi experts,

When we upgraded our PI to 7.3 EHP1 SPS06, our logic which is to map CopyValue into multiple fields doesn't work anymore. It's the same logic used in production which is still running 7.3 SPS07. Since the logic is the same and the only difference is the PI version, we're suspecting that the problem is caused by the upgrade. Is there any restriction now in EHP1 SPS06 that doesn't allow this kind of mapping logic for CopyValue?

Appreciate your inputs regarding this.

Thanks!