block field G/L account in MB21

Hi Experts

The business has requested me to block the G/L account field in the creation of the direct material reservation (MB51). The request is because the generating user many times changes the G/L account that the system defaults based on the material valuation class in the material master data.

In Spro I did not find the option to set the mentioned field as read. Please let me know if you know of any way to block the mentioned field.

Thanks

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