Null value coming in output Schema

I am getting null value in output schema.
i have a input schema which are holding several fields and i have created a another copy of input schema with same naming conversion, no change.

but when i used the output schema for db operation, i am getting null value in dynamic parameter.

when i was checked in tracing i have seen no value coming in dta section.
I am attaching the screen shot of output schema.

Any help is appreciated.

What does your workflow look like and where in the workflow is it failing?

In start button of my subworkflow i am getting the value from parent workflow.
but when i am passing the value to db operation as a dynamic parameter.
Null value is passing to db operation.

To checking the value is coming i created a conversion with as same as input schema and i mapped the fields left to right with all fields.

After that i paste a field to input channel and inbound tracing i have checked that null value coming in output schema so thats the reason in dynamic also its going the null value.

My question is the value we are able to see on Start level of sub workflow in tracing then why is not passing the value to output schema?

why in output is passing the null value?


i found some error in trace.
how to solve this . please provide some solutions

How does the Conversion Type look like?Did you create Schema for your SubWorkflow in Main Workflow?