There is a problem on JBPM 4.4 snapshot when using EL expression #

{provisioningService.checkStatusDelay} that return a duration string like "2 minutes" as timer expression.

Previously on JBPM 4.3, the EL gets evaluated correctly and timer works as expected but I get the following error on 4.4 snapshot.

09:15:26,535 ERROR [ExecuteJobCmd:42] exception while executing 'ExecuteActivityMessage[59]'
org.jbpm.api.JbpmException: Invalid basedate type: #{provisioningService.checkStatusDelay}

is of type java.lang.String. Only Date and Calendar are supported
at org.jbpm.pvm.internal.cal.Duration.calculateDueDate(Duration.java:131)
at org.jbpm.pvm.internal.job.TimerImpl.setDueDateDescription(TimerImpl.java:75)
at org.jbpm.pvm.internal.model.ScopeInstanceImpl.createTimer(ScopeInstanceImpl.java:305)
at org.jbpm.pvm.internal.model.ScopeInstanceImpl.initializeTimers(ScopeInstanceImpl.java:334)
at org.jbpm.pvm.internal.model.ExecutionImpl.createScope(ExecutionImpl.java:264)
at org.jbpm.pvm.internal.model.op.TransitionStartActivity.perform(TransitionStartActivity.java:82)
at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:671)
at org.jbpm.pvm.internal.model.op.ExecuteActivityMessage.execute(ExecuteActivityMessage.java:46)
at org.jbpm.pvm.internal.cmd.ExecuteJobCmd.execute(ExecuteJobCmd.java:76)
at org.jbpm.pvm.internal.cmd.ExecuteJobCmd.execute(ExecuteJobCmd.java:42)