Hi there, you can enforce the lower salary in the following way:
You need to terminate their employment under their current contract first. So you need to follow the termination requirements like procedure and notice as per their current contract and pay them anything they are due on their current salary. Once their employment is terminated you can offer them immediate re-employment on the new contract, incorporating the new lower salary. They can either accept it and continue working there or reject it and leave. If they accept it then obviously this new contract will be what they are employed under and the salary in it is what you have to pay them.
Of course you can simply ask them to agree to it to save yourself having to go through this process and tell them that this is how it would end up anyway so it is up to them whether to just accept it or have it forced through.
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