Instalación y actualización > Windchill ESI > Installing and Configuring Windchill ESI in an SAP Environment > Object Numbering
  
Object Numbering
This section describes various object numbering characteristics and differences between Windchill PDMLink and your ERP system.
Object Numbering and Attribute Field Length Differences
The minimum and maximum lengths, as well as the character makeup of object numbers in Windchill versus SAP, differ. These differences may cause failures or erroneous results when publishing objects from Windchill PDMLink to SAP. The differences can be characterized for each object type (Parts, BOMs, Documents, Process Plans, Sequences, Operations, Process Materials, Equipment, CNs) handled by Windchill ESI.
WindchillObject Type
GUI and Database Out of the Box Maximum Field Length
GUI and Database Out of the Box Typical Field Length
Parts
40 characters
10 characters - all numeric
Documents
32 characters
10 characters - all numeric
Change Notices
32 characters
5 characters - all numeric
Process Plans
40 characters
8 characters
Sequences
40 characters
6 characters
Tooling
40 characters
18 characters
Process Materials
40 characters
18 characters
Operations
No limit
4 characters
Control Characteristics
40 characters
10 characters
* 
For object types other than Operations, the applicable field in the above table is Number. For Operations however, it is Label.
Field Length Differences - Determining How to Compensate
The discrepancies between Windchill and SAP for these field length differences can be compensated in Windchill, in the Windchill EAI components, or in a combination of both systems. For default Windchill and SAP, the following lists where the information is located:
For information on how to limit field lengths in Windchill PDMLink, refer to the instructions in the Windchill Customizer’s Guide.
For information on how to set up auto-numbering in Windchill PDMLink, refer to the instructions in the Windchill Administrator’s Guide.
If Windchill PDMLink or your ERP system has been customized, these documents provide guidance on how to compensate for these field length differences.
The Object Numbering Property
The following traits exist for the property that controls object numbering in Windchill PDMLink:
The auto numbering properties are controlled by the Object Initialization Rules Administrator. There is a unique property that enables or disables auto numbering for each object type. Use the following as an example:
wt.enterprise.GeneratedIdentificationObject.ChangeOrderGenerator.number.format=WFN-ECN{GEN\:wt.enterprise.SequenceGenerator\
:WTCHANGEORDERID_seq\5\:0}
The auto numbering properties handle the following objects:
Parts
Documents
CAD documents
Managed baselines
Product configurations
Products
Change objects
Process plans
Resource groups
Process Materials
Skills
Tooling
Sequences