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data:lv_value type string.

call function 'EVAL_FORMULA'
  exporting
    formula                 = '90 <= 90'
    program                 = sy-repid
  importing
    value                   = lv_value
  exceptions
    division_by_zero        = 1
    exp_error               = 2
    formula_table_not_valid = 3
    invalid_expression      = 4
    invalid_value           = 5
    log_error               = 6
    parameter_error         = 7
    sqrt_error              = 8
    units_not_valid         = 9
    missing_parameter       = 10
    others                  = 11.
if sy-subrc <> 0.
* Implement suitable error handling here
endif.