# Facing a very weird problem with citation

\documentclass[11pt,nonatbib]{elsarticle}
\usepackage[natbibapa]{apacite}

\begin{document}

A number of studies \citep[e.g.,][]{zhou2008impacts, kouvelis2012financing, seifert2013review, lee2018trade, ning2019commitment} confirm that trade credit induces retailer to over-order.

\begin{enumerate}

\item  \cite{lee1997bullwhip} When I comment this line. The output is different. Ideally as far as I know only last name should be included in citation.

\end{enumerate}

\bibliographystyle{apacite}
\bibliography{MWE}

\end{document}


This is the bibliography file content

@article{zhou2008impacts,
title={Impacts of financial collaboration in a three-party supply chain},
author={Zhou, J and Groenevelt, H},
journal={Working Paper},
year={2008},
publisher={The Simon School, University of Rochester}
}
@article{kouvelis2012financing,
title={Financing the newsvendor: supplier vs. bank, and the structure of optimal trade credit contracts},
author={Kouvelis, Panos and Zhao, Wenhui},
journal={Operations Research},
volume={60},
number={3},
pages={566--580},
year={2012},
publisher={INFORMS}
}

@article{seifert2013review,
title={A review of trade credit literature: Opportunities for research in operations},
author={Seifert, Daniel and Seifert, Ralf W and Protopappa-Sieke, Margarita},
journal={European Journal of Operational Research},
volume={231},
number={2},
pages={245--256},
year={2013},
publisher={Elsevier}
}
title={Trade credit financing under competition and its impact on firm performance in supply chains},
author={Lee, Hsiao-Hui and Zhou, Jianer and Wang, Jingqi},
journal={Manufacturing \& Service Operations Management},
volume={20},
number={1},
pages={36--52},
year={2018},
publisher={INFORMS}
}

@article{lee1997bullwhip,
title={The bullwhip effect in supply chains},
author={Lee, Hau L and Padmanabhan, Venkata and Whang, Seungjin},
journal={Sloan management review},
volume={38},
pages={93--102},
year={1997}
}

@article{ning2019commitment,
title={Commitment Role of Trade Credit in a Supply Chain With Buyer Competition},
author={Ning, Jie},
journal={Available at SSRN 3474543},
year={2019}
}


The first image is without commenting the first item.The second image is after commenting the first item.

• There are two authors with surname “Lee” and the style disambiguates by adding name initials. Jul 26 at 14:22
• By the way, biblatex with style=apa does exactly the same, so I guess it is an APA style requirement. Jul 26 at 14:32
• Ok. Thanks. The problem is resolved. Jul 26 at 15:56

In your case, if you omit \cite{lee1997bullwhip} only one first author with surname “Lee” is cited and so no initials are added. With that citation, to the contrary, the rule about adding initials is enforced.
I checked and the same happens with biblatex-apa.