WCEM30 Basket checkout error

10-11  Source: Network gathering  Views:3 

Hi Experts,
I'm working on a new WCEM 3.0 implementation and get a strange error.  The installation is using SAP ECC as a backend, and we are using SAP ECC 5.0 SP9. WCEM is installed on a NW 7.3 SP8.
Products can be added to the shopping basket, but if we have more than one itemline, the application fails with the below exception. If we only have one itemline, it works fine.
We get the error on a clean installation, so no extra development has been done.
Have any of you seen the below error?
500 Internal Server Error is returned for HTTP request [https://XXXXXXXXX:51XXX/main/salestransactions/basket.jsf]:
  component [Faces Servlet],
  web module [main],
  application [sap.com/wec~comm~main~leanapp],
  DC name [sap.com/wec~comm~main~leanapp],
  CSN component[WEC-APP-BF],
  problem categorization [com.sap.ASJ.web.000137],
  internal categorization [-1816753268].
com.sap.wec.tc.core.businessobject.BORuntimeException: RollbackException occured while transaction handling
at com.sap.wec.tc.core.businessobject.BusinessObjectHelper.splitException(BusinessObjectHelper.java:94)
Caused by: com.sap.engine.services.ts.exceptions.BaseRollbackException: Exception in beforeCompletion of ( JTA Transaction : 20302 ).
at com.sap.engine.services.ts.jta.impl2.TXR_TransactionImpl.beforePrepare(TXR_TransactionImpl.java:624)
at com.sap.engine.services.ts.jta.impl2.TXR_TransactionImpl.commit(TXR_TransactionImpl.java:1102)
at com.sap.engine.services.ts.jta.impl2.TXR_TransactionManagerImpl.commit(TXR_TransactionManagerImpl.java:333)
at com.sap.engine.services.ts.jta.impl2.TXR_UserTransaction.commit(TXR_UserTransaction.java:146)
at com.sap.wec.tc.core.common.transaction.TransactionImpl.commit(TransactionImpl.java:40)
at com.sap.wec.app.esales.module.transaction.salesdocument.backend.impl.javadb.SalesDocumentDB.updateInBackend(SalesDocumentDB.java:1812)
... 83 more
Caused by: javax.persistence.OptimisticLockException: Some entity of class >>com.sap.wec.app.module.basket.ejb.entity.ItemEntity<< has been changed by a concurrent transaction
at com.sap.engine.services.orpersistence.core.StoreManager.throwOptimisticLockException(StoreManager.java:1057)
at com.sap.engine.services.orpersistence.core.StoreManager.validateUpdateBatchRcs(StoreManager.java:1151)
at com.sap.engine.services.orpersistence.core.StoreManager.updateEntitiesAsBatch(StoreManager.java:1093)
at com.sap.engine.services.orpersistence.core.PersistenceContextImpl.flush(PersistenceContextImpl.java:607)
at com.sap.engine.services.orpersistence.core.PersistenceContextImpl.beforeCompletion(PersistenceContextImpl.java:1217)
at com.sap.engine.services.orpersistence.core.WrappedPersistenceContextImpl.beforeCompletion(WrappedPersistenceContextImpl.java:35)
at com.sap.engine.services.orpersistence.entitymanager.EntityManagerImpl.beforeCompletion(EntityManagerImpl.java:478)
at com.sap.engine.services.orpersistence.environment.AppJTAEnvironmentManager.beforeCompletion(AppJTAEnvironmentManager.java:197)
at com.sap.engine.services.ts.jta.impl2.TXR_TransactionImpl.beforePrepare(TXR_TransactionImpl.java:589)
Best Regards
looks for me like a bug in the application and potentially in relationship with development in the ERP backend. I would like to help you, but I guess that's only possible if we do debug the application. Probably better to open a OSS message!
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