failed to open a rowset

Hi,

Hope someone can help me.

I am new in creating custom Crystal Report for MSDynamics SL. I created a VIEW to begin with with this statement below:

SELECT
 	APDoc.DocType ,APDoc.RefNbr ,APDoc.BatNbr, APDoc.PerEnt, ApDoc.PerPost
FROM
	dbo.APDoc APDoc WITH(NOLOCK)
WHERE
	APDoc.DocClass = 'N' AND (APDoc.DocType = 'VO' OR APDoc.DocType = 'AD' OR APDoc.DocType = 'AC')
	--AND APDoc.PerPost = '201712'

I also created the following successfully:  created the report in the menu and in Report Control Maintenance, and created a new crystal report file. 

1st. Previewing the report without the option to view data filter by PerPost  is fine.
2nd. When I updated the report control with the setting below

that is when I get this error