Validation - template cannot contain escape characters

Hi all, im new to Warehouse builder, i find the documentation lacking, the tutorials lacking and i can't find any books on warehouse builder either. Am I stupid ? :-)
Anyway, i've set up 3 constants (varchar2) to pass as parameter values to a function im calling and when i try to validate the mapping im getting 'Template cannot contain escape characters'.
Then im getting validation completed successfully..however, when i try to deploy im getting this:
VLD-1141: Internal error during mapping generation.
java.lang.IllegalArgumentException: Template cannot contain escape characters.
at oracle.wh.util.expr.WBLiteralExpression.<init>(WBLiteralExpression.java:34)
at oracle.wh.service.impl.mapping.component.transforms.GenericTransformGenerationDelegate.addContextExpressionsForGroups(GenericTransformGenerationDelegate.java:345)
at oracle.wh.service.impl.mapping.component.transforms.GenericTransformGenerationDelegate.prepareOutputContextPlSql(GenericTransformGenerationDelegate.java:1433)
at oracle.wh.service.impl.mapping.component.transforms.GenericTransformPlSqlDelegate.prepareOutputContext(GenericTransformPlSqlDelegate.java:147)
at oracle.wh.service.impl.mapping.generation.WBMappingGenerator.generate(WBMappingGenerator.java:239)
at oracle.wh.service.impl.mapping.generation.PlSqlGenerationMediator.assembleCursorLoopInternal(PlSqlGenerationMediator.java:3206)
at oracle.wh.service.impl.mapping.generation.PlSqlGenerationMediator.assembleCursorLoop(PlSqlGenerationMediator.java:3190)
at oracle.wh.service.impl.mapping.generation.PlSqlGenerationMediator.assembleRowBased(PlSqlGenerationMediator.java:3115)
at oracle.wh.service.impl.mapping.generation.PlSqlGenerationMediator.assemble(PlSqlGenerationMediator.java:538)
at oracle.wh.service.impl.mapping.generation.WBMappingGenerator.generate(WBMappingGenerator.java:770)
at oracle.wh.service.impl.mapping.generation.WBMappingGenerator.generate(WBMappingGenerator.java:316)
at oracle.wh.service.impl.mapping.generation.WBDeployableMappingGenerator.generate(WBDeployableMappingGenerator.java:99)
at oracle.wh.service.impl.generation.common.WBGenerationService.generateCode(WBGenerationService.java:433)
at oracle.wh.service.impl.generation.common.WBGenerationService.generateCode(WBGenerationService.java:311)
at oracle.wh.service.impl.generation.service.WhValidationGenerationTransaction.run(WhValidationGenerationTransaction.java:241)
I have no clue whatsoever what this is about, can anyone tell ?

hi ,
I also got the same error when i migrated MDL from owb 9.2 version.
I was using OWB 10.2.01, and heard that it is a bug which is fixed in owb 10.2.0.3
So i applied the patch and this error gone.
In case if it help u.
rojo

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    There are to bugs:
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    Bug 5561224 - MIGRATION OF MAPPING REQUIRES CHANGE IN CONFIG TO ALLOW VALIDATION
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    The bug is related to pre/post mapping operators...
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