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Conditional Formatting - Formula Problem?

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    Conditional Formatting - Formula Problem?

    I have a spreadsheet with a list of payments made against contracts. Columns A:D display contract_number, contract_value, Payment_date and payment_amount. In column E, there is a formula to sum the payments at each change of contract number: =IF(A2=A3,"",SUM(D$2:D2)-SUM(E1:E$2)). No big problems with this.

    I have also applied some conditional formatting on column E to highlight when the sum in column E (payments) are not equal to the value in column C (contract_value): =AND(E3<>B3,E3<>"")

    So, if the total invoiced against the contract (E3) is different to The contact value (B3) AND there is a value in E3, then apply formatting.

    However, this doesn't seem to be working very well as several of the cells in column E have the formatting applied where the conditions are not being met.

    Help appreciated.

    Ken
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    Forum Guru Kaper's Avatar
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    Re: Conditional Formatting - Formula Problem?

    you went into problems with rounding values. (not your fault - just known excel problem).
    The numbers in excel are stored as double precision (some 15 digits shall be acurate)

    see rows 14 and 15 if you use not 2 decimal digits but more:

    HTML Code: 
    of course your rule for conditional formatting returns red, because value in column B is different from E

    The cure (one of possible) - change the CF rule formula to:
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    Last edited by Kaper; 01-27-2014 at 01:26 PM.

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    Re: Conditional Formatting - Formula Problem?

    Kaper,

    Thank you very much for your help. I didn't know about the precision level. Who would have thought that adding two numbers together would 'introduce an error'.

    Now I am aware of the error, I decided to change the CF to this, which also works:
    HTML Code: 

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