Stock in Unrest use in previous period for eWM location

Hello Experts

We have a situation where we trying to make a Non-Split Valuated material to Split Valuated.

And while trying to change Valuation Category using MM02 we got error message and we found that there is stock in previous period.

That location is eWM manage location. How can we get rid of previous period stock in ECC?

Thanks

Ankit