In response, we have: 

1. Archived the predecessors (1990m1 to 2019m3) by renaming with an "_11" specifier, marking metadata as "discontinued", and segregating in the catalog. 
2. Created one-for-one replacements, which have an unchanged start date.

Dataset properties:

• Industry classification: SIC Rev. 10
• Measurements: 
• Fixed-base index relative to 2016 (Index 2016=100)
• Thousands of Taiwan dollars (Ths. TWD)
• Seasonal adjustment: Seasonally adjusted (SA) or not (NSA)
• Native frequency: Monthly
• Start date: 1999m1

The series reside in the historical catalog (Taiwan » Consumer » Sales of trade and food services » Monthly) and include, for example:

• WRIRT_11UM.ITWN = [DISCONTINUED] Retail trade: Sales - General index [47 to 48], (Index 2011=100, NSA)
• WRLWT_11UM.ITWN = [DISCONTINUED] Wholesale trade: Sales - Total [45 to 46], (Ths. TWD, NSA)
• WRIRTUM.ITWN    = Retail trade: Sales - General index [47 to 48], (Index 2016=100, NSA)
• WRLWTUM.ITWN    = Wholesale trade: Sales - Total [45 to 46], (Ths. TWD, NSA)
• WRL5620UM.ITWN  = Food services: Sales - Event catering and other [5620], (Ths. TWD, NSA)

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find in catalog" mode that accepts a mnemonic.

See also

• Discontinued Data: Taiwan - Domestic trade growth - Redundant (Mar 2018)
• Discontinued Data: Taiwan - Domestic trade (A) - Redundant (Nov 2015)
• Data Change: Taiwan - Domestic Trade Index - Rebased to 2006 (May 2009)