"Expected hash" Freemarker error in FindInventoryEventPlan

This error was reported on ofbiz-users by Medhat Abdel Badie on 11 Feb 2013 (http://mail-archives.apache.org/mod_mbox/ofbiz-user/201302.mbox/%3CCAFm1-vWx8VvXN2o3C2fZmUGv9wJuGN9RB16QgjuSnCGyv83jAg@mail.gmail.com%3E)

Reproducing Scenario:
• Carton_M (Type : Finished Good) contains 2 Carton_S (Type : Raw
Material) as Manufacturing BOM.
• For both Products Go to Facilities >> Edit Product Facilities >> Add
the Facility "Web Store Warehouse"
• Leave "MINIMUM STOCK" Empty or set it to Zero
• Create sales order containing 1 Carton_M product, then Approve the
order.
• Go to the Manufacturing >> MRP, and run MRP

Then click on the Find button at the bottom of the page to show planned inventory events. You'll get:

"Expected hash. initialQohEvent evaluated instead to freemarker.template.SimpleScalar on line 165, column 26 in component://manufacturing/webapp/manufacturing/mrp/findInventoryEventPlan.ftl"