This is the paradox of EMSO. The very systems you use — radar, radio, GPS — are the ones you want to disrupt on the enemy side. But your jammer also disrupts your own receivers. This is called fratricide (or, more technically, EMI — electromagnetic interference). Without coordination, your own EA leaves your own sensors and links deaf and blind.
Deconfliction is therefore not an administrative detail but an operational necessity. A concrete tool is the JRFL (Joint Restricted Frequency List): a list of frequencies that must not be jammed because friendly or neutral users depend on them (e.g. friendly data links, emergency and air traffic frequencies).