The script to remove LiteSpeed Log shipping plan will also remove the SQL Server native log shipping plan if both plans have the same name.
LiteSpeed Log Shipping Plan must have a unique plan name
The script SLS_Remove_Plan will run successfully with only the PlanID. To determine the Plan ID (rather than the Plan Name) use Microsoft Enterprise Manager or Query Analysis query LSPlans Table to determine the PlanID.
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Do not use the same names as the native SQL Server log shipping plans.
Issue fixed in version 4.7.0.00096.