A numeric field added on the nth step does not allow you to add decimal values by default. Even if there is a pattern that allows decimals, the complete value is blanked out on entering the decimal value.

Add the below code block to the field in the ‘specimenCollection’ section to allow entering numeric values at the nth step.

{
        "name" : "specimen.extensionDetail.attrsMap.how_much_quantity_of_sample_was_used",
        "baseField" : "specimen.extensionDetail.attrsMap.how_much_quantity_of_sample_was_used",
        "modelOpts" : {
          "allowInvalid" : true
          }
}

Example JSON

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OpenSpecimen

Allow Decimal Values on nth Step

Example JSON