Report shows "No data found" when validation fails

Question

Hi folks,
I'm new to the OTN and have a short question regarding validations/report pagination.
We are using Apex 4.0.2.00.07.
I have a page containing a report with three columns.
First column is a checkbox (f30), the second one a date picker and the third one is a value field (f34).
I'm trying to build a validation for the value field (should only allow numeric values, but is varchar2) and used a validation with "Function Returning Boolean".
The PL/SQL code is:
DECLARE
vrow BINARY_INTEGER;
v_number FLOAT:=0;
BEGIN
FOR i IN 1 .. APEX_APPLICATION.g_f30.COUNT
LOOP
BEGIN
vrow := APEX_APPLICATION.g_f30 (i);
v_number := to_number(APEX_APPLICATION.g_f34(vrow));
RETURN TRUE;
EXCEPTION
WHEN OTHERS THEN
RETURN FALSE;
END;
END LOOP;
END;
The validation works fine, but every time I enter a non numeric value and the validation fails (error message is displayed correctly as notification) I get a "report error: ORA-01403: no data found" in the pagination area of the report.
Tried to disable pagination completely, but the error still displays when the validation fails.
Any help would be appreciated.
Thanks in advance and regards
Sandro

Answer 1

Content of the checkboxes is ok, debugging showed
1:7     
2:8
(records 7 and 8 where ticked)
Debugging console also shows:
     0.10900     0.00000     Processing point: Before Box Body          
     0.10900     0.00000     Region: Shareclassinformation          
     0.10900     0.00000     Item: P59_IS     
     0.10900     0.00000     Item: P59_NA
     0.10900     0.00000     Item: P59_CO
     0.10900     0.00000     Region: Attribute Selection
     0.10900     0.00000     Item: P59_LO
     0.10900     0.00000     Item: P59_ID
     0.10900     0.00000     Item: P59_IDAH
     0.10900     0.00000     Item: P59_IDAT
     0.10900     0.00000     Item: P59_SHO
     0.10900     0.00000     Item: P59_UTD
     0.10900     0.00000     Item: P59_X NA
     0.12500     0.00000     Region: Attributes
     0.12500     0.23400     Item: P59_NOT
     0.12500     0.00000     show report
     0.12500     0.00000     determine column headings
     0.12500     0.00000     parse query as: DB
     0.35900     0.14100     binding: ":P59_LOV_AT"="P59_LOV_AT" value="64"
     0.35900     0.00000     binding: ":P59_IDT"="P59_IDT" value="51"
     0.50000     0.01500     print column headings
     0.50000     0.00000     rows loop: 20 row(s)
     *0.51500     0.01600     report error: ORA-01403: no data found*
     0.51500     0.00000     Computation point: After Box Body
...