Install the current level of the CICS® Type 3 SVC, DFHCSVC, before you attempt to start a region. To install the CICS Type 3 SVC:
Do not relink-edit the DFHCSVC module in order to install it into the LPA. The term install means move or copy a module into the LPA by using SMP/E, or a copying method that re-blocks the copied modules when the target data set has a smaller block size than the data set you are copying from.
The DFHCSVC module, as supplied, has the attributes AMODE(31) and RMODE(ANY); do not change these attributes.
For further information about installing the DFHCSVC module in the LPA, see Installing CICS modules in the MVS link pack area.
The current version of the CICS SVC module is compatible with all earlier releases of CICS, which enables you to run your earlier CICS regions with current regions in the same MVS image.
CICS contains a test to verify that it is using the correct level of the CICS DFHCSVC module. If CICS calls an SVC module using the SVC number specified on the CICSSVC system initialization parameter, and the module is not at the current level, CICS issues message DFHKE0104. As a result of this message, CICS either abends with a system dump, or prompts the operator to enter an alternative SVC number, depending on the option specified on the PARMERR system initialization parameter.
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