Hi CapsLock,
Are you using a custom SSRS free text invoice? and have you applied any MS update recently? There was a similar discussion in Yammer group that the FTI custom report was broken after the update, because of new parameter
SSRS Report "FreeTextInvoice" is not working after Microsoft Update
Reason is a new Report parameter that came with 10.0.11 (or maybe 10, I jumped a bit).
This causes problems in some cases.
Problem is, the new parameter "SuppressDepreciationOfPaymentSection"
is not setup as "Allow Blank" and "Nullable" like most of the other parameters.
Our FreeTextInvoice is a copy (the way a SSRS report has to be extended),
the copy don't contains the extra parameter.
My 'detour' solution was to copy the report again from orig including the new parameter,
copy the designs from old copy to new copy
and set the not correct configured parameter to "Allow Blank" = True and "Nullable" = True.