Question regarding units of measure in SAP enterprise services

Hi,

is there a rule, that SAPs enterprise services should use ISO-codes as units of measure?

There is a curious behavior in service ECC_PRODUCTIONCONFCRTRC.

http://es-workplace.sap.com/socoview(bD1lbiZjPTAwMSZkPW1pbg==)/render.asp?id=04BE184D8B3711DA36BB000F20DAC9EF&fragID=&packageid=E42EA5C4BC46A3F1BEA5005056A500B9&iv=

In the request message is a quantity for the confirmation of production order and a second quantity for the goods movement information.

Our SAP backend (ECC 6.0 EHP7) only excutes both actions if I use ISO-Code UOM (e.g. PCE) for the confirmation of production order and Internal UOM (e.g. ST) for the goods movement.

Units of Measure in Enterprise Services

Is this a bug?

Regards

Roland