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CATIA V6 Assembly design: Can't add any constraints


I'm very new to CATIA. While following some V5 assembly design tutorials, I couldn't find the constraints toolbar. Then I came to know that the V6 equivalent is the engineering connections tool, but the tool is greyed out.

I've tried simple assemblies, as well as imported some sample parts to make one, but the engineering connections tool is always greyed out.

What am i doing wrong?