Check - In CAF Development Components in NWDI: appropriate prefix not found

Hi,
I am developing CAF on the Composition Environment and use an NWDI structre.
If I create a CAF DC on the track and define CAF Components(Business Object, Application Service...) in the DC, check in of these Activities throws me the following error and activation fails.
Invalid name: appropriate prefix not found; choose another name or another name server
com.sap.lcr.namealloc.api.NameSyntaxViolation: Invalid name: appropriate prefix not found; choose another name or another name server
     at com.sap.lcr.namealloc.NameServerUtil.checkForAllowedNamePrefix(NameServerUtil.java:1463)
     at com.sap.lcr.namealloc.NameAllocator.allocateName(NameAllocator.java:1022)
     at com.sap.lcr.namealloc.NameAllocator.reservePreliminary(NameAllocator.java:1283)
     at com.sap.ide.dii05.lib.internal.namereservation.NameReservation.reserve(NameReservation.java:134)
     at com.sap.ide.dii05.lib.internal.namereservation.NamereservationUtil.reservePackagesForDc(NamereservationUtil.java:222)
     at com.sap.ide.dii05.ui.internal.listener.NameReservationListener.reservePackages(NameReservationListener.java:79)
     at com.sap.ide.dii05.ui.internal.listener.NameReservationListener.validateNameReservation(NameReservationListener.java:72)
     at com.sap.ide.dii05.lib.internal.namereservation.VetoListener.beforeOperation(VetoListener.java:134)
     at com.tssap.dtr.client.lib.util.impl.VetoEventHandler.fireEventBeforeOperation(VetoEventHandler.java:46)
     at com.tssap.dtr.client.lib.vfs.impl.VersionedFileSystemManager.fireEventBeforeOperation(VersionedFileSystemManager.java:1693)
     at com.tssap.dtr.client.lib.vfs.impl.VfsActivity.checkIn(VfsActivity.java:1722)
     at com.tssap.dtr.client.lib.vfs.impl.VfsActivity.checkIn(VfsActivity.java:1661)
     at com.tssap.dtr.client.lib.vfs.impl.VfsCheckInOperation.perform(VfsCheckInOperation.java:33)
     at com.tssap.dtr.client.lib.vfs.impl.VFSOperationsGroup.performNew(VFSOperationsGroup.java:226)
     at com.tssap.dtr.client.lib.vfs.impl.VFSOperationsGroup.perform(VFSOperationsGroup.java:121)
     at com.tssap.dtr.client.lib.vfs.actions.CheckinAction.execute(CheckinAction.java:117)
     at com.tssap.dtr.client.eclipse.ui.actions.VfsObjectSelectionAction$5.doDtrJobInWorkerThread(VfsObjectSelectionAction.java:606)
     at com.tssap.dtr.client.eclipse.job.DtrJob.doInWorkerThread(DtrJob.java:49)
     at com.sap.ide.dii05.util.api.job.JdiJob$1.doInWorkerThread(JdiJob.java:75)
     at com.sap.ide.dii05.util.internal.job.InternalJdiJob$3$1.run(InternalJdiJob.java:224)
     at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1797)
     at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1779)
     at com.sap.ide.dii05.util.internal.job.InternalJdiJob$3.run(InternalJdiJob.java:233)
     at com.sap.ide.dii05.util.internal.job.BusyBackgroundIndicator.showWhile(BusyBackgroundIndicator.java:74)
     at com.sap.ide.dii05.util.internal.job.InternalJdiJob.internalRun(InternalJdiJob.java:214)
     at com.sap.ide.dii05.util.internal.job.InternalDiiJob.run(InternalDiiJob.java:275)
     at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
I am generating, building and compiling the CAF DC before check-in the activity.
Can you please help me about this issue?
Regards,
Yasar

Thanks Jan! It solved!
I have already created another workspace after all the tests just to be sure that the problem wasn´t on NWDS.
It solved to me when I removed the reservation on SLD and recreated.
Thank you so much!
Gabriela

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