Bring dates and 1-1/2 cups water to a boil in medium saucepan. Reduce heat and simmer uncovered, stirring occasionally, until mixture is thickened and only few pieces of dates remain, about 3 minutes. Stir in lemon juice and vanilla. Let stand to cool.
Preheat oven to 350° F (180° C). Lightly spray 23 cm square baking dish with no-stick cooking spray; set aside.
Combine flour, oats, sugar and baking soda in medium bowl. Cut in Becel® sticks and 2 tablespoons water with pastry blender or finger tips until mixture is size of small peas. Press 1/2 of the mixture onto bottom of dish. Top evenly with cooled date mixture. Crumble remaining oatmeal mixture over date mixture; press gently.
Bake until crumb is golden brown, about 30 minutes. Cool completely on wire rack before cutting.