Landed Cost is an optional entry which can be used for Quotes and Margins for setting pricing. If you enter a cost in Landed Cost it will calculate a Landed Cost Percentage, which is used to adjust Landed Cost when Vendor Cost changes.
If you enter zero (0) for Landed Cost it will erase Landed Cost Percentage, too, effectively disabling this option. If you want Landed Cost to be zero (to be used for Margins), enter minus one-hundred percent for Landed Cost Percentage. (7139)