SAP Message UA_INV_VALUATION031 - Lock cannot be released

Diagnosis
An attempt was made to unlock one or more prices. However, the systemsettings do not allow this.

System Response
The price still cannot be changed.

Procedure
If organizationally desired, the message type of error message CK171 canbe changed in Customizing for Product Cost Planning to W (Warning). Thisenables the prices to be unlocked.
It is also possible to prevent the lines from released cost estimatesfrom being locked at all. To do this, set message CK171 to I(Information).