I have a program that reads a KSDS via CIs.
While adding support for EF I put the following comments:
".Added Extended Addressability KSDS support. In the EA KSDS, RBA
in index records is expressed as relative CI number: this means
that it needs to be multiplied by CI length to calculate a true
RBA value.
.Converted RPL OPTCD from RBA to XRBA (this is required if
Ext-Addr KSDS with size above 4GB is being processed: RBA
should work until 4GB RBA is reached. It would fail from 4GB and
above). Although, apparently, with PTF for APAR OW43595 applied -
XRBA is required for Extended Addressability datasets regardless
of dataset size."
I do not know if any of the above would apply to ESDS/ your application
though.
Hth...
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