Hallo, I need a little help to code ERC for two body parts moving in oposite direction like airplane carriage wheel legs - one is rotating +90 degrees up and down and the other -90 degree up and down. Thank you! 

Assuming both are Up at zero, and assuming you want a control dial on
BODY to move both, here's how the three pieces of code would look:

First the control dial in BODY:

        valueParm Legs-Down
            {
            name Legs-Down
            initValue 0
            hidden 0
            forceLimits 1
            min 0
            max 1
            trackingScale 0.1
            keys
                {
                static  0
                k  0  0
                }
            interpStyleLocked 0
            }

===================

Then the ERC code for the leg that goes to +90:
(This goes just below the 'interpStyleLocked' line
in the appropriate rotation, probably X-rot.)

            valueOpDeltaAdd
                Figure 1
                BODY
                Legs-Down
            deltaAddDelta 90.0

===================

Then the ERC code for the leg that goes down to -90:
(Again after 'interpStyleLocked' in xrot)

            valueOpDeltaAdd
                Figure 1
                BODY
                Legs-Down
            deltaAddDelta -90.0

Thank you, I will try it...