Intercompany Master Scheduling Error

Hi all, Since few months we see the same error message when our MRP batch job is running. Does any one has an idea of the cause of that? Do we need to pay attention of that error? We always see status = error for that type of job but Master scheduling jobs are working fine for the other companies. Any idea will be appreciated.

Below is is the type of error we always have. WHAT DOES IT MEAN?? WHAT CAN BE DONE TO MAKE SURE THAT THE I****NTERCOMPANY MASTER SCHEDULING I IS WORKING PROPERLY???

" Cannot release the lock ReqPlanVersion:ushp:MasterPlan:5637162138 because it has not been acquired or has been already released"

'Microsoft.Dynamics.Ax.Xpp.ErrorException: Exception of type ‘Microsoft.Dynamics.Ax.Xpp.ErrorException’ was thrown.

at Dynamics.Ax.Application.ReqCalcScheduleItemTable.Run() in ReqCalcScheduleItemTable.run.xpp:line 23

at Dynamics.Ax.Application.InterCompanyReqCalcSchedule.Runreqcalcinonecompany(String _companyId, String _planId, ReqCalcUpdate _reqCalcUpdate, Boolean _copyToStaticPlan, Boolean _copyToDynamicPlan) in InterCompanyReqCalcSchedule.runReqCalcInOneCompany.xpp:line 44

at Dynamics.Ax.Application.InterCompanyReqCalcSchedule.Run() in InterCompanyReqCalcSchedule.run.xpp:line 38

at Dynamics.Ax.Application.BatchRun.runJobStatic(Int64 batchId) in BatchRun.runJobStatic.xpp:line 50

at BatchRun::runJobStatic(Object[] ) at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters) at BatchIL.taskThreadEntry(Object threadArg)"