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When processing an invoice, the invoice preparer overrode the fee to equal a decided fee value. This triggered a purple line, and although not stated we assumed the invoice preparer received a message. You would like to confirm if this message was an error. In short it is not an error but a warning - explanation, so the invoice preparer can choose the right invoice format with which to present the fee override in context of the invoice presentation decisions she made. The only time this would be an error is when the client requires a detailed electronic invoice with the intent to audit each record to ensure there are no fee overrides.
The message explains that the combination of time entry billing increments used (which in your firm may be in 10ths of an hour - for example 0.20, 0.30) multiplied by the rate for the working members, when considered in context of the presentation rule selected in the details tab, does not mathematically result in the fee override applied.
To keep the fee override applied, the application reverse calculates the sum of entry billed values (time * rate), and the difference between this sum and the fee override, is applied to the largest time record and presents it in purple. The indirect warning is so that if the invoice preparer is issuing a detailed time entry invoice, they consider choosing a format without all of the entry details (for example time, rate and value), as this may highlight to the recipient the slight discrepancy which made the sum of the details work.
Presentation decisions do not impact the fee allocation, The fee allocation will allocate the fee value using the allocation formula of the firm. This is not directly related to time entries, even though indirectly it maybe related to worked values if the allocation scheme of the firm is based on that (most typical for most firms).