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1) write so lotus script code that does the calculations and store it in QuerySave Event of the form..

2 ) Use calculated values for the the other fields

Here is 2)

You will also obviusly need to setup "input validation" formulas for the fields C,D,E and F since the other fields use these values to calculate themselves...

so for C,D,E,F use the "INPUT VALIDATION" formulas like

@If(C="";@Failure("You must enter a value for C");@Success);

Now for your calculated fields make them "computed" with a value of :

Field F

@If(A!="" & E!="";A*E;0)

Field G

@If(F!="" & B!="";F*B;0)

Field H

@If(D!="" & F!="";D+F;0)

Field I

@If(H!="" & G!="";H+G;0)

Field K

@If(H!="" & L!="";1-(H/L);0)

Field L

@If(L!="" & J!="" ;I/(1-J);0)

Field M

@If(C!="" & L!="" ;C*L;0)

I have noticed that some of your formulas may cause an error such as I/1-J is infinite if J =1 so your may want to change the formula to

@If(L!="" & J!="" & J!=1 ;I/(1-J);0)

Also, notes computes fields top to bottom left to right , so you will need to store the fields that are dependent on other fields below those fields i.e on your form the order of your fields should be

F , G , H , I , L , K , M

This is because K uses the value of L so it needs to be calculated first

Hope this helps !!