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Changes between Version 3 and Version 4 of PDAF_put_state_generate_obs

-              v3
+              v4
  * `U_init_obserr_f`: The name of the user-supplied routine that initializes the vector of observations error standard deviations for for full observation vector
  * `U_prepoststep`: The name of the pre/poststep routine as in `PDAF_get_state`
  * `status_pdaf`: The integer status flag. It is zero, if `PDAF_put_state_generate_obs` is exited without errors.
+ * `status_pdaf`: The integer status flag. It is zero, if the routine is exited without errors.
 The user-supplied call-back routines are described on the [ImplementGenerateObs page on implementing the generation of synthetic observations].
+It is recommended that the value of `status_pdaf` is checked in the program after PDAF_generate_obs is executed. Only if its value is 0 the initialization was successful.
+PDAF also has a [PdafSimplifiedInterface Simplified Interface] providing the routine `PDAF_put_state_generate_obs_si`. In the simplified interface, the name of the user-supplied routines have predefined names and do not appear in the call to `PDAF_put_state_generate_obs_si`.  More information on the pre-defined names is provided in the [ImplementGenerateObs page on implementing the generation of synthetic observations].
+It is recommended that the value of `status_pdaf` is checked in the program after the routine is executed. Only if its value is 0 the initialization was successful.