The first item that controls the assignment of a user code is sysparm DSCBUSRD. It is used to provide the displacement into the DSCB to find the user code field. If this displacement is zero, which is the default, an attempt is made to find a user code in member USERCODT. If this member is defined, it can supply the code. But by default it is not defined and processing returns. When this member check returns and no code has been assigned, either the DSCBUSRD sysparm-defined displacement is used to find the user code, or an index level of the data set name is used. Since the index level technique must be activated specifically by sysparm DBDSNINX, the resulting default is to use the displacement method. Each of the possible methods is defined in more detail below.
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