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<h1>Error E2121 – Manual Numbering Not Allowed</h1>
<div class="trix-content"><p>When you receive the following error message :<br><br><em>E2121 - ECE_SOAPFaultResponse: We received an error response from the server: FaultCode: Client String.....: You may not enter numbers manually. If you want to enter numbers manually, please activate Manual Nos. in No. Series AA-INV. detail: [string: You may not enter numbers manually. If you want to enter numbers manually, please activate Manual Nos. in No. Series AA-INV. Attributes: xmlns = "http://schemas.microsoft.com/2003/10/Serialization/"] , Data sent: &lt;soap:Body&gt;&lt;CreateMultiple xmlns="urn:microsoft-dynamics-schemas/page/salesinvoice"&gt;&lt;SalesInvoice_List&gt;&lt;SalesInvoice&gt;&lt;No&gt;LV00001&lt;/No&gt;&lt;Sell_to_Customer_No&gt;1234&lt;/Sell_to_Customer_No&gt;&lt;Your_Reference&gt;0Q0Q5000002knsbKAA&lt;/Your_Reference&gt;&lt;External_Document_No/&gt;&lt;Stripe_ID/&gt;&lt;SalesLines&gt;&lt;Sales_Invoice_Line&gt;&lt;Type&gt;G_L_Account&lt;/Type&gt;&lt;No&gt;1041&lt;/No&gt;&lt;Quantity&gt;1.000000&lt;/Quantity&gt;&lt;Unit_Price&gt;100.00&lt;/Unit_Price&gt;&lt;Shortcut_Dimension_1_Code&gt;S10&lt;/Shortcut_Dimension_1_Code&gt;&lt;Shortcut_Dimension_2_Code/&gt;&lt;Description&gt;Discounts&lt;/Description&gt;&lt;/Sales_Invoice_Line&gt;&lt;/SalesLines&gt;&lt;/SalesInvoice&gt;&lt;/SalesInvoice_List&gt;&lt;/CreateMultiple&gt;<br>&lt;/soap:Body&gt;</em><br><br>It means that the system is trying to create a Sales Invoice using a manually defined number (e.g., &lt;No&gt;LV00001&lt;/No&gt;), but the No. Series assigned (AA-INV) does not allow manual number entry. Business Central or NAV expects to auto-generate the number instead.&nbsp;<br><br>You have two options to resolve this:</p><p>1. Remove the &lt;No&gt; field from your request payload.<br>&nbsp; &nbsp; - Business Central or NAV will then auto-assign the next available number from the 'AA-INV' series.</p><p>2. Enable Manual Numbering in Business Central or NAV (requires admin access):<br>&nbsp; &nbsp; - Go to 'No. Series' in BC.<br>&nbsp; &nbsp; - Locate the 'AA-INV' line.<br>&nbsp; &nbsp; - Tick the checkbox for 'Manual Nos.'<br><br>Unless there's a business requirement to control invoice numbers externally (e.g., syncing with Salesforce or another system), we recommend using Business Central's or NAV's auto-numbering for consistency and to avoid duplicate or conflicting values.<br>&nbsp;<br>&nbsp;If you must set your own numbers, coordinate with the BC administrator to ensure proper setup of the No. Series.</p></div>
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