Connect Month names formated as Text to Month names in the date table

[Anonymous]

I have a text column that contains month names in the format "mmm". Additionally there is a date column for the year. The months in the date column and the months in the text column do not have to be identical.

I now want to link this text column with the month names in the calendar table. But it does not accept this as a correct relationship. So what to do?

How can I tell Power BI that the texts are month names, so I can then process them as such.

[HotChilli]

"it does not accept this as a correct relationship" - what message do you get?

Maybe you can show us.

[Anonymous]

Here the error message in English: This relation has a cardinality of m:n. This may only be used if no column (neither "month" nor "month name") is expected to contain unique values, and if the significantly different behavior of m:n relationships is known. 

[v-jingzhang]

Hi @Anonymous 

It is a warning message which will appear when you want to create a many-to-many relationship between two tables. If you are sure to create a many-to-many relationship, you can go on to save this relationship. You may want to learn more about many-to-many relationship before using it: Many-to-many relationships in Power BI Desktop, Many-to-many relationship guidance.

Hope this helps.

Community Support Team _ Jing
If this post helps, please Accept it as the solution to help other members find it.

[mahoneypat]

Actually, that is a warning and not an error.  It is good practice to avoid many to many relationships.  Since both tables have multiple rows for each Month, a M:M is necessary.  To avoid it, you would need to create a Month table (1 row/month) or add a column with the first/last of that month and use that new column in a relationship with the DaxKalendar[Datum] column.

Pat