How to export a work item template for a Delivery Process from RMC and then import it to RTC?

Hi All, In Rational Method Composer (RMC) tool, I had tried exporting a work item template for a Delivery Process using the option 'Export a Work Item Template' available in the Authoring perspective in the Process Editor in the Work Breakdown Structure tab (Right click on DP -> Export to Work Item Template) and was able to save the work  item template as XML in my local drive, and was also able to import this work item template to RTC, but was not able to create work items in RTC using this imported template, and it was giving an error as mentioned below.

"Error creating work item set from template. The Work Items were not created. Details: Save Work Item Failed. Preconditions have not been met. The Phase Detected attribute needs to be set."

Could you please help me out on this.