Hi Sarita,
When recording intercompany transactions through journals, AX uses the intercompany accounts setup in GL "in between".
Can you please try the following: In the company where the financial dimensions are suspended setup a valid (non-suspended) fixed dimension value for the ledger accounts setup under GL/setup/intercompany accounting. This should ensure that the suspended financial dimensions are not touched and that your postings should go through.
Hope it helps,
Ludwig