You can specify an option as often as you want, and in as many sources as you want. If you specify the positive and negative form of an option (for keyword pairs), or two or more different values (for a value keyword), these option specifications are "conflicting" options. If all specifications of a particular option are at the same level of precedence, the last specification takes effect, and a warning message is issued. If some conflicting specifications are at different levels of precedence, then the specification at the higher order of precedence takes effect, and (in general) the assembler issues a warning message for each option that is not accepted. A warning message is not issued if the higher level of precedence is a *PROCESS OVERRIDE statement, unless the option cannot be set by a *PROCESS statement.