ZAP will not work with SQL Server Express, you must use a SQL Statement such as:

DELETE FROM <TableName> WHERE 1=1

This is compact syntax for clearing all records from a table. SQL Server handles tables quite differently than VFP so you dont have to worry about PACK or DELETED. Once a record is deleted in SQL Server it is gone for good. There are several wor arounds if this is not the behavior you want such as adding a deleted flag column to your table and adding a WHERE clause to your SELECT statement to only return record where for example :

SELECT * FROM TableName WHERE TableName.IsDeleted = 0  && False with SQL Server

Remember when using SQL Server that the Boolean 0 = .f. in VFP and Boolean 1 = .t.