HAT5644   {0} for build {1} cannot be applied to build {2}

The fix you are trying to apply cannot be applied to the installed product. The most common reason for this is you are trying to apply a CAPAR that is not required for your product build level. For example, you applied and committed CAPAR-1 followed by CAPAR-3 and then tried to apply CAPAR-2. Another reason for this message is you are trying to apply a CAPAR to a beta version of the product.