The ddname for a text library must match the TXLIB value on
the ++JCLIN or element MCS. For example, the ddname for the text
library on statement ++MOD(MODA) TXLIB(LIBX) must be LIBX.
Use
Text libraries contain JCLIN input or replacements for macros,
source, or object modules that have not been link-edited. They are
used when the JCLIN or elements are provided in partitioned data sets
rather than inline or in relative files.