You should disable entering of dimensions on account 51203001 or adjust automatic journal and default dimension setup to have dimensions populated correctly automatically.

How does one do this?

Please review this 5 part series of short blogs presented by Pam Nightingale. This includes examples with screenshots and covers the foundation of analytical dimension configuration. I posted the 5th session below and you can find the rest from there. After this, if you still require assistance, you have the option to contact your local regions support center.

communityhub.sage.com/.../understanding-dimension-types-and-analytical-dimensions-in-sage-x3-part-v