SVG Chart with CheckSum (CS) in link

Hi,
I've got a SVG chart with links in it. If I do links without checksums it works fine. The second I add a checksum it gives me the following error:
 
XML Parsing Error: not well-formed
Location: http://myurl.com:8080/apex/f?p=107:6:2218842577149441:FLOW_SVG_CHART_R7148121064428318_en-us
Line Number 22, Column 1690:
 
I'm using Oracle XE w. APEX. Heres' what I did.
Initially in my query I had the following for the link column:
f?p=&APP_ID.:3:&SESSION.::NO::P2_ID:4
This worked and had no problems whatsoever.
 
Now I tried to add the checksum (as required by Page 3)
HTMLDB_UTIL.PREPARE_URL('f?p=&APP_ID.:3:&SESSION.::NO::P2_ID:4')
This gave me the error that I mentioned above.
 
To confirm that it was the checksum I did one last test where I manually entered in a checksum (I know the checksum is wrong but I just wanted to see if it would show the table or not)
f?p=&APP_ID.:3:&SESSION.::NO::P2_ID:4&cs=123
Again this gave me the error.
 
Any ideas on this?

Is there no possibility?

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