Specifying bidirectional logical relationships
When defining a bidirectional relationship with physical pairing, you need to include an LCHILD statement under both logical parents and, in addition to other pointers, the PAIRED operand on the POINTER= parameter of the SEGM statements for both logical children.
When defining a bidirectional relationship with virtual pairing, you need to code an LCHILD statement only for the real logical child. On the LCHILD statement, you code POINTER=SNGL or DBLE to get logical child pointers. You code the PAIR= operand to indicate the virtual logical child that is paired with the real logical child. When you define the SEGM statement for the real logical child, the PARENT= parameter identifies both the physical and logical parents. You should specify logical twin pointers (in addition to any other pointers) on the POINTER= parameter. Also, you should define a SEGM statement for the virtual logical child even though it does not exist. On this SEGM statement, you specify PAIRED on the POINTER= parameter. In addition, you specify a SOURCE= parameter. On the SOURCE= parameter, you specify the SEGM name and DBD name of the real logical child. DATA must always be specified when defining SOURCE= on a virtual logical child SEGM statement.