Disallowed wash sale amount is zero, should be blank. I change it but it refills with zero??? help 1099-B worksheet. I can't efile without this being corrected

I cannot correct "disallowed wash sale amt". msg: Accrued market discount should not be 0. Enter blank if entire loss is disallowed. I blank it out but it repopulates.    This was not a wash sale. bought in July sold in december.