This is a problem introduced only in V11 in patch 18.

The message will be Product code followed by (mess. 177,199,1), "Some mandatory Analytic Dimensions were not indicated"  (BRI) an alternative version is  "Mandatory analytical dimensions are missing"

The issue surrounds mandatory dimensions on creation of a purchase invoice. The key to the problem is that there are no mandatory dimensions against the GL account code being used on the Purchase invoice Line(s)

You can tunnel to or open the account and these mandatory dimensions will not be listed under the analytical tab.

They should not be flagged as mandatory on creation of the invoice and this is being fixed.

If you require a Hot Fix for this then please raise a case with Customer Service in the normal way. Please mention the fix number 7065

As this problem was introduced in P18 there are no dependencies for this Hot Fix

For clarity it is only V11 P18 - not V12 that has this problem.