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User experience “Enter G/L Account No” error when creating PR.

This error related to gl account automatic posting, thus related to material valuation class.
Go to Display Material MM03 > Accounting 1 tab to see material valuation class.

Go to OMWB to see G/L Accounts in MM Account Determination (Materials Management > Valuation and Account Assignment > Account Determination > Account Determination without Wizard > Configure Automatic Posting > G/L Accounts)
Configuration shows that the valuation class only has one gl account configuration, that is account balance. While the P&L account is not configured yet.
300116     Receipt Credit A/C (GR/IR) - Services              Balance
           3090 Services Expenses          
                WRX GR/IR clearing account

Compare with valuation class that has balance and P&L gl account pair.
300116     Receipt Credit A/C (GR/IR) - Services              Balance
    2060 Stationeries/Supplies/Pri
        WRX GR/IR clearing account
780000 Stationeries/Supplies/Printing/Photocopy P&L
    2060 Stationeries/Supplies/Pri
        GBB Offsetting entry for inventory posting
        VBR Consumption for Internal Goods Issues
        VBR Consumption for Internal Goods Issues

I should ask accounting to config P&L account for this automatic posting then, since this things is their authority.