When you use the M and MP options, ISPF does not provide library concatenation support. You can specify up to four input libraries as the "From" data set. However, only the first library in the sequence is searched. Therefore, the member to be moved, which is either specified in the Member field or selected from a member list, is moved only if it is found in the first library. However, the other three library names remain on the panel and can be used with the C and CP options.