# Invoices Used Outside UNOSOF
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Home/ Accounting/ SRI Electronic Transfer/ **SRI Electronic Management.**
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The option ADD BLANK INVOICE button, it is used to skip a sequential (SRI Invoice ID) and use it in another (accounting) system where it is necessary to use the numbering (sequential) for both export and national.
#### Example
You want to skip the sequential 3005 of the batch of national invoices, for the sale of a Vehicle
**Step 1:** Press the Add Blank Invoice button (appears only in the SRI/Invoice/Generate/Sign/Send module)
**Step 2:** Check in the module: **Invoices Used Outside UNOSOF.** You will see the 3005 sequential is skipped.
Step 3: An informative note can be added in the NOTE field
## Return a Sequential to use it in UNOSOF
By mistake, the sequence could have been skipped, with Add Blank Invoice.
We will use the same previous example: return the sequential of the National lot 3005 to the SRI Invoice IDs**.**
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This option works when the skipped sequence is the last one AND the following sequences have not been used yet.
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**Step 1:** The skipped sequence (3005) is no longer available, and can be verified in the ADD BLANK INVOICE segment (national)
**Step 2:** Find the sequential (3005) in Invoices Used Outside UNOSOF
**Step 3:** Press the DELETE button to delete that skipped sequence, and return it to the SRI-XML generation module
**Step 4:** Check if the sequence is available again, in the SRI-XML generation module, Add Blank Invoice (national) segment
## Return a sequencial to use it (when it is not the last sequence )
You should follow the same steps of the previous option, but the sequential will be available in the option: **Unused (Skipped) Invoices**, since it is not the last one, for example the sequential 2989 instead of the last one 3005.
The steps can be found in the following manual:
{% content-ref url="unused-skipped-invoices" %}
[unused-skipped-invoices](https://manual.unosofbooks.com/accounting/sri-electronic-transfer/sri-electronic-management/unused-skipped-invoices)
{% endcontent-ref %}
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