User changing values of performed calculation

Is there a way in acrobat for the user to change the value of a calculated field once a calculation has already been performed?
Is there a script you can create to over-ride the calculation being performed?
Thanks

What I posted will automatically calculate the field whenever either the tax1 or taxbase field value changes. If the tax1 field is blank, it will use the default value of 4.5. The user is then able to manually change the value of the calculated field if desired.
For what it's worth, the following line of code probably does not do what you think it does.
(Number(this.getField(Field_Name).value.length) != 0)
When the value of the field is numeric (e.g., 1.2), the data type of the value will be number, and since a number does not have a length property, it will return the special value of "undefined". When undefined is converted to a number using Number, it returns the special numeric value of NaN. Since NaN is not equal to zero, the result of the comparison in the if statement will always be false. That's why I retrieved the value of the field as a string, since it is easy to see if the field is blank and you can simply use the + operator to convert it to a number.
It doesn't appear as though you posted the entire code that you were using (note the missing closing curly bracket), so I'm not sure the revised code is doing what you want. Is the following true:
1. When the tax rate field is blank, calculate using the default value of 4.5
2. When the tax rate field has a value that's not equal to 0, calculate using the value in the tax rate field.
Exactly what should happen if the tax rate field is not blank but the value is equivalent to zero (e.g., "0", "0.00", ".", "-", etc.)?
Do you want the user to be able to enter whatever they want in the calculated field, thus manually overriding the calculated value?

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    st_date = '01'.
    ind = 0.
    ind = ind + 1.
    here i am passing the low value and high value.
    yto_charsel-chanm = '0CALDAY'.
    yto_charsel-seqno = 1.
    yto_charsel-sign  = 'I'.
    yto_charsel-opt   = 'EQ'.
    yto_charsel-LOW = st_date.
    yto_charsel-chanm = '0CALDAY'.
    yto_charsel-seqno = 1.
    yto_charsel-sign  = 'I'.
    yto_charsel-opt   = 'BT'.
    yto_charsel-high = ev_days.
    INSERT yto_charsel INTO sto_charsel INDEX ind.
    ETO_CHARSEL = sto_charsel.
    lto_value = sto_charsel.
    How can i pass user input value to read this exist ,some where again i have to write code or else??
    This is very urgent can you help me..

    Hi,
    Instead of two perform statements, use single perform.
    PERFORM get_value USING i_area
                              i_variable
                         CHANGING lw_varsel.
    Take the values from lw_varsel-low.
    FORM statement for this perform is as follows.
    DATA: li_varsel TYPE STANDARD TABLE OF upc_ys_api_varsel,
            lv_varsel TYPE REF TO cl_sem_variable.
      FORM get_value USING p_area TYPE upc_y_area
                           p_variable TYPE upc_y_variable
                     CHANGING
                           p_lw_varsel TYPE upc_ys_api_varsel.
        CALL METHOD cl_sem_variable=>get_instance
          EXPORTING
            i_area       = p_area
            i_variable   = p_variable
             I_CREATE     =
          RECEIVING
            rr_variable  = lv_varsel.
           EXCEPTIONS
             NOT_EXISTING = 1
             others       = 2
        IF sy-subrc <> 0.
          EXIT.
        ENDIF.
        REFRESH li_varsel.
    ****Getting the Value*********
        CALL METHOD lv_varsel->get_value
          EXPORTING
            i_user     = sy-uname
            i_restrict = 'X'
          RECEIVING
            rto_value  = li_varsel.
        CLEAR : p_lw_varsel.
        READ TABLE li_varsel INTO p_lw_varsel INDEX 1.
        IF sy-subrc <> 0.
          EXIT.
        ENDIF.
      ENDFORM.                    "get_value
    Try this code.
    Bindu

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