Troubleshooting Guide for CFP Add-in for Excel 365

You work with the Lucanet.Excel Add-In and notice that your Lucanet formulas are displayed with the prefix _xldudf_, e.g. _ xldudf_LN_VALUE instead of their expected format (LN.VALUE).

This indicates that Excel cannot recognize or resolve the custom Lucanet functions such as LN.VALUE(), LN.ATTRIBUTE(), and other LucaNet-specific formulas used to retrieve data from Consolidation & Financial Planning (CFP).

The error typically occurs when two or more versions of the Lucanet.Excel-Add-In are installed and active simultaneously:

Since both add-ins use identical formula names, Excel cannot determine which version to execute, causing the function resolution to fail.

To fix the error, you must deactivate the legacy Lucanet.Excel-Add-In while keeping the CFP Add-in for Excel 365 active. Proceed as follows:

After restart, Lucanet formulas will display correctly without the _ xldudf_ prefix. The COM add-in remains on your system and can be reactivated if needed.

Deactivating the COM add-in does not delete it from your system - it simply prevents it from loading when Excel starts. You can reactivate it later if needed by following the same steps and activating the check box again.

The CFP Add-in for Excel 365 will handle all Lucanet formula calculations going forward.

When multiple users edit the same Excel file simultaneously using the CFP Add-In for Excel 365, Excel recalculates the formulas very frequently. This slows down MS Excel and affects workflow.

This behavior depends heavily on the file size, the number of formulas, and the number of users editing the file.

This error typically occurs when:

To fix the error, every user working on the file must disable automatic formula calculation in MS Excel.

To do this, open the Formulas tab in the Excel ribbon and select the Manual option under Calculation Options:

You can then manually calculate formulas using the Refresh button on the Lucanet CFP Add-in tab in the Excel ribbon.

After migrating from the Lucanet COM Add-In to the CFP Add-in for Excel 365, LN formulas in existing workbooks display a #NAME? error when the workbook is opened. The formulas do not return data on the first load.

Once a cell containing an LN formula is activated (for example, by pressing Enter) or the formula is re-entered manually, the data refreshes correctly.

The COM Add-In and the CFP Add-in for Excel 365 are built on fundamentally different technologies. When an LN formula is entered using the Lucanet COM Add-In, Excel stores a hidden reference in the cell pointing specifically to that add-in. When the workbook is subsequently opened with only the CFP Add-in for Excel 365 active, Excel cannot find the original add-in reference and displays #NAME?.

To register all LN formulas in the workbook to the CFP Add-in for Excel 365, use Excel's Find & Replace function to force Excel to re-evaluate the formulas:

Excel re-evaluates all formulas in the workbook and registers them under the CFP Add-in for Excel 365. After this step, LN formulas will work correctly on subsequent opens.