It seems to me (through debug) that SUS communicated with R/3 and tax has been calculated in R/3 and get the tax amount back to SUS. Later 'somehow' ( ?!!! ) SUS doesn't use the tax amount in SUS at the line item of the invoice and still the tax amount is zero. So the Invoice (IDOC) to R/3 contains the PO Netvalue (without tax amount) and invoice document is created in R/3. When I analyzed the invoice document in R/3, due to the amount discrepancy ( tax amount is not included in the IDOC as it was not calculated in SUS) the document is not posted.
So I am looking for "someone" who can tell me (not based on the SAP document, based on the REAL experience) YES SUS-Invoice will work in SUS-MM scenario even if the tax calculation occurs in R/3 and the tax amount of the SUS-Invoice line item will be updated before sending (through IDOC) the invoice to R/3.
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