RPAS- Writable Measure becomes readable on adding rule.(locking)

Hello Team,

For measure CMU %, as soon as we add any rule for this measure. The measure becomes readable for future period. Even when the property in configuration is set to "write".

The measures involved in the rule do not use lag function.

Tried with aggregation as total / recalc - still the issue persists.

Rule in Base configuration is as below :

BUWpCMUP = ((tssum(BUWpBOSR,first,first) + tssum(BUWpRecR + BUWpMiscInR - BUWpMiscOutR + BUWpMkupR )) - (tssum(BUWpBOSC,first,first) + tssum(BUWpRecC + BUWpMiscInC - BUWpMiscOutC  ))) / (tssum(BUWpBOSR,first,first) + tssum(BUWpRecR + BUWpMiscInR - BUWpMiscOutR + BUWpMkupR ))

For testing purpose we tried to patch it with a basic rule as :