SAP Message KI806 - Transaction & has been locked

Diagnosis
Business transaction &v1& has been locked for controllingarea/version &v2& infiscal year &v3&, period &v4&.

System Response
The function cannot be executed for locked periods.

Procedure
Limit processing to the periods which are not locked, if possible.
If locked periods are necessary for processing, unlock them.
Execute

496596Reversal in special period not possible
454124WIP calc/results analysis: End indicator D and period lock
124929Posting profit center: Error KI260/BS014/KI806
314120Error message KI088 with invoice verification
127974KP06ff: KI806/K8037 Period blocks