For IJG, the Commission has defined for certain common indicators the possible values for the baseline or reference value. Some need to be 0 (E0), others equal or higher than 0 (EH0) and others higher than 0 (H0).
When Validation Rule 072 (Validate in table 3 for each common result indicator under ERDF/CF/JTF when a baseline validator exists (baselineValidator), that the baseline value is compliant (zero, equal or higher than zero, higher than zero)) is triggered you can check this list for the different values that have been defined.