How to hide zeroes in the output

I need to suppress zeroes in the output. I have a Data template which selects the data from a view. The original view fields are showing 0's if the underlying value is null.( eg. create view v1 as select nvl(field1,0),nvl(field2,0)... from table1
I tried the following ways to fix the issue. But no success.
1. Changed the view and removed the NVL function on the view
create view v1 as select field1,field2,... from table1
After this the xml output is generated and shows nulls for these fields. But OPP is failing with 'Cannot convert to number' Here is the snapshot of the error.
Caused by: oracle.xdo.parser.v2.XPathException: Cannot convert to number.
at oracle.xdo.parser.v2.XSLStylesheet.flushErrors(XSLStylesheet.java:1526)
at oracle.xdo.parser.v2.XSLStylesheet.execute(XSLStylesheet.java:517)
at oracle.xdo.parser.v2.XSLStylesheet.execute(XSLStylesheet.java:485)
at oracle.xdo.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:264)
at oracle.xdo.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:150)
at oracle.xdo.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:187)
... 17 more
2. Using the xpath expression
<?format-number(field1[.!=0],"####", "")?>
This way I am seeing a square symbol for the fields having zeroes
I am sure there will be simpler way of hiding zeroes in the output. But I am not getting any clues. Any ideas.
Thanks

Hi,
I may have misunderstood something. In the option 1 you mention that by removing the nvl you were getting nulls?
If you are getting zeros then you should be able to use <?if:field1!=0?>...<?end if?>. It's possible you might need to put '0' around the value if it thinks it is text.
Also I'm not sure your format-number syntax is correct. It looks like you are mixing the Oracle formatting and the Microsoft formatting (ie when you set the form field type to number) together. I've used the following successfully:
<?format-number:FIELD1;'PT9G990D00'?>
Hope this helps.
Paul

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