The CORRESPONDING option of the MOVE, ADD, and SUBTRACT verbs allows the programmer to specify group items as operands in order to use their corresponding subordinate data items. All identifiers in a CORRESPONDING phrase must refer to group items.
The operation specified by the statement acts on each pair of corresponding items in the specified group items. If two or more source data items have the same name, or two or more destination items have the same name, the operation may be performed more than once on some items.
Data items are considered to correspond if they match the following rules. In these rules, ident-1 and ident-2 refer to the two group items specified in the CORRESPONDING phrase.