Direct query and calculated column based on two tables

Hi

I hope you can help me with my challenge:

I have 2 direct query tables, that are connected with relation.

Table 1 is called orderdata having 2 columns: orderstatus and custorder. 

Table 2 is called salesdata and has 3 columns: shipdate, proddate and custorder (custorder is the relation link here)

I'm trying to create a calculated column which will work as follows (this syntax is more VBA than DAX, but that's where I feel more comfortable):

testcolumn1 = if(orderdata[orderstatus]<>"closed" and salesdata[proddate]=month(now()),"IN",if(orderdata[orderstatus]="closed" and salesdata[shipdate]=month(now),"IN",""))

testcolumn2=if(orderdata[orderstatus]<>"closed" and salesdata[proddate]<>month(now),"OUT","")

I hope it makes sense.

If this can't be done in powerbi, I'll just make it in ms access or sql, where the original data is located.

thanks in advance for any help

Marek