Metadata upload issue in PI 7.4 Java stack

Hello All,

I need your help.

We are using PI 7.4 single stack and for one Idoc scenario, we wanted to upload idoc metadata from ECC system with Version 4.6.

we are facing Error : IDOC_ERROR_METADATA_UNAVAILABLE. We have successfull connection in place because we can successfully upload other standard Idoc metadata from same ECC, but issue is only with custom Idoc

Kindly suggest how to proceed further.

Thanks,

Shiv