ObjectDataCompiler converter does not compile all template rules

When trying to compile a rule template with a datasource of a lot of rows (more than 1000), the compilers only compiles the first 1286 lines in the datasource.

Here is the code I am using:
//50,000 classes are created in the collection
Collection<FRTRule> freights = FilesLoader.GetFreightRules();
ObjectDataCompiler converter = new ObjectDataCompiler();
//a very simple rule template is loaded.
final InputStream templateStream = new Object().getClass().getResourceAsStream( "/Rules/Freight.drl" );
//only 1286 rules are created in the drl string.
String drl = converter.compile( freights, templateStream );

Here is the rules template syntax:
template header
pol

package com.zim.pricing.rules
import com.zim.PricingPOC.PricingUI.FRTRule;

template Pricing

rule "Pricing_@

"

when
m : FRTRule(pol == "@

")
then
m.setPol("1");
end

end template

What could the reason be that the compiler only compiles 1286 rules?

Thanks,

Guy