In fact, if the proposed move amounts to a «material change in circumstance affecting the child,» it may be grounds to vary an existing custody / access order. (familylawhelp.ca)
A parent seeking to change or modify a child support order must show an ongoing material change in circumstances. (divorcenet.com)
Other material change in circumstances may include a change in the child's needs, a change in a parent's schedule or a change in a parent's treatment of the child. (divorcesource.com)