Thank you for the answer, I use python to work with images, so, i am not using SNAP. In the meta data.
<BOA_QUANTIFICATION_VALUE unit="none">10000</BOA_QUANTIFICATION_VALUE> for L2A
so quantification value is 10000 for Level 2A data.
problem is my band values are ranging 0 to 17800. if i divide band/10000 still there are values greater than 1.0.