If/Then Statements with Text Numbers

g-wizard Try:

IF( [Channel Program Description]="PVD K20 Milling grades KCK20B & KCKP10"
&&
[MARA MATNR TRIM: Material Number (trimmed) (v DIM MATERIAL MASTER)]="7009750",
[MARA MATNR TRIM: Material Number (trimmed) (v DIM MATERIAL MASTER)]<> "7009750"
)

That said, I don't understand what Tableau would return in that circumstance. Perhaps if you provided sample data and expected output this would go quicker. Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.

Try this

[MARA MATNR TRIM: Material Number (trimmed) (v DIM MATERIAL MASTER)]

=SWITCH(TRUE(),[Channel Program Description]="PVD K20 Milling grades KCK20B & KCKP10" && [MARA MATNR TRIM: Material Number (trimmed) (v DIM MATERIAL MASTER)]="7009750","7009750","")