Invalid String Constant

[ASG0856]

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We are running Actuate 7 against an Aircraft Engineering Database. The following code comes from the original IQ Report to calculate the remaining life:
NVL(case when NVL(cadb:'lits'.longtth.act_occ, 0) = 0 then (cadb:'lits'.longttn.fst_mtr_red - cadb:'lits'.prmr.cum_met_red)
[Red] else case when
NVL(cadb:'lits'.stdfreq.fix_sch_ind, 'N') = 'Y' then cadb:'lits'.longttn.frm_int - (cadb:'lits'.prmr.cum_met_red - cadb:'lits'.schfreq.trg_lmu_val ) [/Red]
else cadb:'lits'.longttn.frm_int - ( cadb:'lits'.prmr.cum_met_red - cadb:'lits'.longttn.lst_acl_mtr ) end end, 0.00)

It is set as a calculated field in the QBE SQL, and Actuate happily accepts it. However, when an attempt to run the Report in ErdPro is made it fails with an Invalid String Constant. If I remove the line in red, it runs quite happily. We here cannot see what's wrong, but maybe we're to close. Thnxs in advance for any advice.
ASG

 

[gdwood]

If you remove the red lines it works? Even though there are two 'END's there? Is there another case statment? Or do you remove the other end?

 

[ASG0856]

To clarify, the reference to that case statement is removed in its entirety, including the 'End' that goes with the case statement.
ASG

 

[gdwood]

Did you solve this one yet? You can tyr a few things and nothing looks out of place here, but I'm wondering if the rules of the case mean you have to end the inner and then the outer and they can't share an else? Can you try the select case statement?