3409004 - Showing message "Changes not possible. The configuration is locked"

In the app 'Manage G/L Account Master Data' / 'Manage Operating G/L Accounts,' it is showing the message: 'Changes not possible. The configuration is locked'.

SAP S/4HANA Cloud Public Edition

In a three-tier SAP S/4HANA system landscape which typically includes Development, Test and Production systems all configurations should be done in the Development system. In your Development system it should not be locked, if you are not in an upgrade phase. In Test and Production systems you can only read the data.

This is to ensure that configurations are properly version-controlled and transported in a systematic way from the Development system to the Test/QA system and finally to the Production system.

In a two-tier SAP S/4HANA system landscape which typically includes Test and Production system all configurations should be done in the Test system and then transported to the Production system. In your Test system it should not be locked, if you are not in an upgrade phase. In Production system you can only read the data.

Manage G/L Account Master Data 
Manage Operating G/L Accounts

Changes not possible. The configuration is locked, Manage G/L Account Master Data, Manage Operating G/L Accounts, G/L accounts, Master data accounts, S4_PC, S4_1C, FI-FIO-GL-MD-2CL, F0731A, F0731B.  , KBA , FI-FIO-GL-MD-2CL , Master Data Apps (Public Cloud) , Problem