I am reviewing my assembly of Z profiles and making small changes to dimensions here and there.  One dimension fails to change in the assembly although it has changed in the part.

Image Sketch shows me editing the sketch of the extrusion of part Z150-12 bottom chord.  The heights of the two lips of the profile are now each 15 mm.  Previously it was 16.2 mm.

Image Extrude shows me editing the extrusion after exiting the sketch.  The selected contour has lips 15 mm high.

Image Measure shows me measuring the height of one lip in the assembly, from the edge of the lip to the underside face of the Z, after re extruding, backing out of editing the component, and rebuilding.  The dimension shows the old 16.2 mm, not the new 15 mm.

What have I overlooked?