Markup vs Margin option
Measure Designer and Premier offer the option to choose Markup or Margin as the calculation selection for Overhead Percentage. Measure 15.0.3557 extended this selection to apply to Worksheet Line Items as well. However, this was deemed to be a poor design decision and is being rolled back in a patch update, 15.0.3559. See the Known Issue article for a more complete explanation.
Please use this post to indicate that you would like to see an option to apply Markup to worksheet line items instead of the default Margin calculation. If this is done, it would likely be a separate option than the current setting that only applies to the Overhead Percentage.
Note, this ability would only be available to Measure Designer and Premier users who have their projects set to Commercial mode.