BM keeps planning things on DH’s custody time
She literally won't stop. SS got invited to a birthday party a couple of weeks ago. It was for this weekend which is DH's custody time. She told SS he could go. Nobody says a word to DH. Then she texts DH on Wednesday (she's suppose to be using OFW but doesn't) and tells DH that SS was invited to a party on Friday. He has asked her at least 20 times to stop planning things during his parenting time, to stop telling the kids they can go to parties or whatever on his time without discussing it with him.
She completely ignores him and keeps doing it. Is there ANY way to stop this?