To set accuracy value for angular dimension you must convert them to angle format and set primary accuracy value for dimension element. To convert accuracy to angle format you must change value by rule:

Accuracy Angle Accuracy

OdDgDimTextFormat::kAccuracyNone = OdDgDimTextFormat::kAccuracyNone (0) OdDgDimTextFormat::kDecimal1 = 1 OdDgDimTextFormat::kDecimal2 = 2 OdDgDimTextFormat::kDecimal3 = 3 OdDgDimTextFormat::kDecimal4 = 4 OdDgDimTextFormat::kDecimal5 = 5 OdDgDimTextFormat::kDecimal6 = 6

To set angle accuracy for dimension style use this function and accuracy value ( don't change format )

OdDgDimStyleTableRecord Methods