If you report a problem with High Level Assembler to your IBM Support Center, you will receive a tape containing one or more APARs or PTFs that have been created to solve your problem.

You might also receive a list of pre-requisite APARs or PTFs, which should have been applied to your system before applying the current service. These prerequisite APARs or PTFs, might relate to High Level Assembler or any other licensed product you have installed, including z/OS.

To help you understand the service process, the following overview familiarizes you with applying service for High Level Assembler.