SAP Function Module search on KL_FO
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KL_FORM_ADDON_CALC - Calculates an addon from the variable and percentage rate
KL_FORM_MAXIMUM_AMOUNT - Calculation of the Maximum of Two Amounts
KL_FORM_MINIMUM_AMOUNT - Calculation of the Maximum of Two Amounts
KL_FORM_X_PLUS_ADD_ON - Calculates value + add-on, and returns the value, add-on, and total
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