You can address them in two ways:
(a) using fixed numerical offset and length
(b) symbolically, using the SAP Data Dictionary
Please see our Tips&Tricks No. 17 for (a) and Tips&Tricks No. 20
for (b). For an example dealing with tables and structured records please see
Tutorial Nr. 5 for InputAssistant.
In order to work with symbolic names instead of numeric offsets,
you need a valid RFC user in GuiXT profile, with authorizations
RFC_TYPE=FUGR, RFC_NAME=SIFD, ACTVT=16
(see www.synactive.com->Documentation, "Remote Function Call"). GuiXT reads the
SAP dictionary information via a BAPI call the first time symbolic fields are
used in a script.