🇵🇾 Paraguay

This sheet assumes you know the generic FM 3.0 screens (FM 3.0 modules) and the local/centralized operation model (Methods and parameters). Here we only document what is specific to Paraguay: the administration of the Series in electronic documents (DE).

Summary

Billing system	SIFEN
Documents	DE (Documentos Electrónicos / Electronic Documents)
Standard numbering	0000001–9999999 per document type, without series
Series	Once standard numbering is exhausted: two uppercase letters (AA…ZZ, excluding Ñ), in sequential order

A. Series administration

1. Initial sequence:
   1. Use standard numbering (without series) from 0000001 to 9999999 (nine million nine hundred ninety-nine thousand nine hundred ninety-nine) for each document type.
2. Series start:
   1. Once standard numbering is exhausted, activate the use of series.
   2. Define the series with combinations of two uppercase letters (excluding Ñ).
   3. Practical example: start with series AA.
3. Use of additional series:
   1. Establish a predetermined series order: AA, AB, AC, ..., AZ, BA, BB, ..., BZ, ..., ZA, ZB, ..., ZZ.
   2. Validate sequentiality according to this order.
   3. Practical example: after AA, use AB, AC, and so on.
4. Series starting date:
   1. Upon receiving a DE with a series, take the digital signature date and time as the starting date of the corresponding series.
5. Series validation:
   1. Approve a DE under the following conditions:
      1. Immediately preceding series: DE with a series prior to the highest series sent to the system, with a digital signature date prior to the effective start date of the current series.
      2. Same series: DE with a series equal to the highest series sent to the system.
      3. Immediately following series: DE with a series after the highest series sent to the system, with a digital signature date after the effective start date of the current series.

B. Additional considerations and controls

1. Series integrity: validate that the assigned series has not been previously used, to prevent duplicates.
2. Log of used series: maintain a historical record of all used series for audit and traceability.
3. Standard numbering exhaustion notification: alert when standard numbering is close to being exhausted, to prepare the transition to series.
4. Sequentiality maintenance: implement controls to ensure correct sequentiality within each assigned series.
5. Audit of used series: perform periodic audits to ensure continued compliance with regulations and the validity of the series used.