Field help (ECCROUFLG) 

Select this check box if routings for this product can be version-managed. This check box is only available when a sequence number of a major version (Major sequence field) has been defined for this product and if a major version is displayed.

Select this check box to manage (major and minor) routing versions independently of any stock version or bills of materials (BOM) for this product.

Leave this check box clear if you do not require routing versions for this product.

Routings versions for this product can only be managed if this product is version-managed.

You cannot change this check box once the first major routing version has been assigned to this product.