Se ha producido un error: EJBException:; nested exception is:
   javax.ejb.EJBException: Application Error: tried to enter Stateful bean with different tx context, contextTx: TransactionImpl:XidImpl[FormatId=257, GlobalId=alejandria.dip-badajoz.es/74854, BranchQual=, localId=74854], methodTx: null