Multiple document types in crystal report

i try to fetch multiple doc types in crystal report.. If doc type is CN then amount in - and if amount doc type is DN then it must be + ... . i want like this

Code:

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crystal report
no. doctype docno  docdate customer exempteddate S.Tax Rate S.t Amount
1  CI      12  01-01-2016  ABC                  150  20%  15200*
1  CN      12  01-01-2016  abc                  -32  20%  1234*

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this is what i tried

crystal report

Code:

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no. doctype docno  docdate customer exempteddate S.Tax Rate S.t Amount
1  CI      12  01-01-2016  ABC                  150  20%  15200*

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whatever the amount is i write rough amount
query ...i paste specific line

Code:

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and acdochdr.doctype='CN', 'DN' ,'CI'

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any solution?