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IDOC Invoice PO Error External system returned different number of items: Input <> Output

Hi All,

When posting an invoice to PO via idoc (basic type INVOIC01)

I'm getting the following error message:

External system returned different number of items: Input <> Output

Message no. FS888

I found this 2 posts, but none of them were useful in this case:

https://archive.sap.com/discussions/thread/2012326

https://archive.sap.com/discussions/thread/1915240

This error only happened in a pre-production system.

I'm not getting any errors in Development and Quality systems.

Do you know what could be causing this?

Thanks in advance!

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1 Answer

  • Nov 29, 2017 at 03:19 PM

    If the issue happens in all landscapes, then, you can check the configuration and other interface related settings. But in your case, it is not so. Also, I am not sure whether you have gone through the OSS note mentioned in one of the links you shared. If that note does not address your issue, then, you can have a look at another OSS note 1499319.

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